Thursday, April 9, 2015

Chapter 5_Evolutionary Psychology and Scripture Scholarship

Introduction

[In the case of both evolutionary psychology and biblical criticism,] we find claims and assertions incompatible with theistic or Christian belief; here there really is conflict. But…I call this conflict “superficial”…[E]ven though Christians are committed to a high view of science, and even if these disciplines do constitute science or good science (a state of affairs that is by no means self-evident), these developments in evolutionary psychology and historical biblical criticism don’t offer, or even threaten to offer, defeaters for Christian or theistic belief.[1]

I. Evolutionary Psychology

Evolutionary psychology –

Evolutionary psychology is an attempt to explain important human traits and behaviors in terms of the evolutionary origin of the human species. The heart and soul of this project is the effort to explain distinctive human traits – our art, humor, play, love, sexual behavior, poetry, sense of adventure, love of stories, our music, our morality, and our religion itself – in terms of adaptive advantages accruing to our hunter-gatherer ancestors back there on the plains of Serengeti.[2]

Adaptation – An inherited physiological, affective, or behavioral characteristic that reliably develops in an organism, increasing its chances of survival and reproduction.[3]

If we follow standard evolutionary theory, anything produced by an adaptive process that is not an adaptation must fall into one of two categories: it can be either (1) a one-off random or accidental effect of gene combination – noise, we might say, a mutation – or, (2) a causally related by-product of an adaptation or arrangement of adaptations.[4]

Spandrel – A trait that isn’t itself fitness enhancing, but is a consequence of traits that are (Stephen Jay Gould and Richard Lewontin)[5]

Steven Pinker: [M]usic was useless in terms of human evolution and development…[I]t is ‘auditory cheesecake,’ a trivial amusement that ‘just happens tickle several parts of the brain in a highly pleasurable way, as cheesecake tickles the palate.’[6]

Plantinga: It’s a little startling to see something as deep, powerful, and significant as music denigrated or defended in those terms. Is an activity important only if it has played a prominent role in our evolution, enabling our ancestors to survive and reproduce? What about physics, mathematics, philosophy, and evolutionary biology itself: do (did) they have evolutionary significance?...Indeed, given the nerdness factor, undue interest in such things would have been counterproductive in the Pleistocene. What prehistoric woman would be interested in some guy who prefers thinking about set theory to hunting?[7]

Q1: Does evolutionary psychology hold that the only value or importance a particular trait can have is given by its role in our evolutionary history and/or its fitness-conferring effects? In what sense is it denigrating to these features of human nature to attempt to explain them with reference to their role in our evolutionary history?

Q2: What do the terms adaptation and by-product mean in the context of discussions of human beings, given their capacity to “repurpose” many of their traits to achieve novel ends?

à Alternative account: Cultural evolution (Denis Dutton)

Denis Dutton:

My arguments are built on the idea that a vocabulary of adaptations versus by-products cannot make sense of the ancient origins and present reality of aesthetic and artistic experience. To be illuminated by evolution, the arts do not at all need to be glorified as Darwinian adaptations similar to language, binocular vision, or the eye itself. Neither should the arts be dismissed as the by-products of a collision of human biology with culture. The arts intensify experience, enhance it, extend it in time, and make it coherent.[10]

“Just-So Story” objection –

A frequent critique of EP is that its hypotheses are difficult or impossible to adequately test, challenging its status as an empirical science. As an example, critics point out that many current traits likely evolved to serve different functions than they do now, confounding attempts to make backward inferences into history.[11] Evolutionary psychologists acknowledge the difficulty of testing their hypotheses but assert it is nevertheless possible.

Critics argue that many hypotheses put forward to explain the adaptive nature of human behavioural traits are "just-so stories"; neat adaptive explanations for the evolution of given traits that do not rest on any evidence beyond their own internal logic. They allege that evolutionary psychology can predict many, or even all, behaviours for a given situation, including contradictory ones. Therefore many human behaviours will always fit some hypotheses. Noam Chomsky argued:

"You find that people cooperate, you say, ‘Yeah, that contributes to their genes' perpetuating.’ You find that they fight, you say, ‘Sure, that’s obvious, because it means that their genes perpetuate and not somebody else's. In fact, just about anything you find, you can make up some story for it."

à Leda Cosmides answers this objection as follows:

"Those who have a professional knowledge of evolutionary biology know that it is not possible to cook up after the fact explanations of just any trait. There are important constraints on evolutionary explanation. More to the point, every decent evolutionary explanation has testable predictions about the design of the trait. For example, the hypothesis that pregnancy sickness is a byproduct of prenatal hormones predicts different patterns of food aversions than the hypothesis that it is an adaptation that evolved to protect the fetus from pathogens and plant toxins in food at the point in embryogenesis when the fetus is most vulnerable – during the first trimester. Evolutionary hypotheses – whether generated to discover a new trait or to explain one that is already known – carry predictions about the nature of that trait. The alternative – having no hypothesis about adaptive function – carries no predictions whatsoever. So which is the more constrained and sober scientific approach?"[12]

Michael Ruse and E.O. Wilson: “[E]thics is an illusion fobbed on us by our own genes to get us to co-operate; thus morality ultimately seems to be about self-interest.”[13]

Platinga: Why altruism?[14]

à Herbert Simon: This behavior…is to be explained at the individual level in terms of two mechanisms: “docility” and “bounded rationality”…[15]

Plantinga: The idea is that a Mother Teresa or a Thomas Aquinas display “bounded rationality”; they are unable to distinguish socially prescribed behavior that contributes to fitness from altruistic behavior (socially prescribed behavior which does not). As a result they fail to acquire the personally advantageous learning that provides that increment d of fitness without, sadly enough, suffering that decrement c exacted by altruistic behavior. They acquiesce unthinkingly in what society tells them is the right way to behave; and they aren’t quite up to making their own independent evaluation of the likely bearing of such behavior on the fate of their genes. If they did make such an independent evaluation (and were rational enough to avoid silly mistakes), they would presumably see that this sort of behavior does not contribute to personal fitness, drop it like a hot potato, and get right to work on their expected number of progeny.[16]

Q3: Do you think that evolutionary psychology can provide a satisfactory account for the things the Plantinga lists (music, religion, science, art, etc.)? Do you think such an account is necessary to maintain the plausibility of evolutionary psychology?

Q4: Do you think these apparent cases of altruistic behavior present a problem for evolutionary psychology? If so, what problem specifically does it present, and how might it be overcome?

Q5: What are the strategies available within evolutionary theory that might be applied to constructing a satisfactory account of the above traits?

à Below are a few possibilities:
·      Natural selection (adaptation with respect to physical environment, including other organisms with which a species interacts, e.g., a tiger’s stripes)
·      Sexual selection (adaptation with respect to sexual pressures, e.g., a peacock’s tail)
·      Genetic drift (changes in allelic frequency in a population due to random sampling of organisms)
·      Cultural evolution[17] (learned behaviors or acquired traits, e.g., a chimpanzee using a stick to collect ants)
·      By-products/”spandrels” (non-adaptive traits that are the consequences of adaptive traits)
·      Genetic linkage (non-adaptive traits that are genetically “linked” to adaptive traits)
·      Vestigiality (genes whose expression is neutral with respect to fitness or not fitness-diminishing to an inhibitive extent, e.g., appendix in humans)

II. Evolutionary Psychology and Religion

Some examples of evolutionary accounts of religion:

Steven Pinker: “[R]eligion is a desperate measure that people resort to when the stakes are high and they have exhausted the usual techniques for the causation of success – medicines, strategies, courtship, and, in the case of the weather, nothing.”[18]

Rodney Stark proposed a theory according to which religion is a kind of spandrel of rational thought, and attempt to acquire nonexistent goods – eternal life, a right relationship with God, salvation, remission of sins – by negotiating with nonexistent supernatural beings. The idea is that rational thought, that is, means/end or cost/benefit thinking, some to be in the usual evolutionary way. But having the capacity for such thought inevitably carries with it the capacity to pursue nonexistent goals, like the pot of gold at the end of the rainbow; or the ones connected with religion.[19]

David Sloan Wilson: religion is essentially a means of social control employing or involving fictitious belief.[20]

Pascal Boyer: religion is a whole family of cognitive phenomena involving “counterintuitive” beings (beings who act in ways counter to our ordinary categories): for example, religion often involves beings who can act in the world without being visible.[21]

Scott Atran: “Religion is (1) a community’s costly and hard-to-fake commitment (2) to a counterfactual and counterintuitive world of supernatural agents (3) who master people’s existential anxieties such as death an deception.”…[W]hile our minds have come to be and have been developed by natural selection, religion itself isn’t adaptive, but is a byproduct of our cognitive architecture.[22]

Q6: Do you think any of the accounts above have any merit? If so, which one(s) and why? Does anyone else want to suggest a possible alternative to the accounts presented above?

à Plantinga’s first reply to all of these theses is just that you can remove certain non-essential elements (typically the claim that theism is false) and have something that is still consistent with all the empirical evidence supporting it but also compatible with theism.[23] 

Plantinga: [W]ouldn’t there be another theory, perhaps just as good and even empirically equivalent to Stark’s, that was noncommittal on the existence or non-existence of these goods?[24]

Stark-minus: [T]he claim that: (a) religion involves the pursuit of certain kinds of ends or goods – salvation, eternal life, and the life – by way of negotiating with alleged supernatural beings, and (b) that it arises as a kind of byproduct or spandrel of the evolution of the capacity for rational thought.[25]

Wilson and Ruse-minus: [M]orality – that is, belief in an objective obligation to treat others the way we would like them to treat us, together with the resulting tendency to behave in accordance with this belief to at least some extent – the theory says only that this phenomenon is adaptive at the group and has become ubiquitous among human beings by way of group selection.[26]

Plantinga’s second line of defense is to confront the claim, thought to be implicit to the above accounts, that descriptions of the origin of religious belief and the cognitive mechanisms involved impugning the truth of those beliefs.

Plantinga: Describing the origin of religious belief and the cognitive mechanisms involved does nothing, so far, to impugn its truth. No one thinks describing the mechanisms involved in perception impugns the truth of perceptual beliefs; why should one think things are different with respect to religion?[27]

Q7: Do you agree with Plantinga’s statement above? Why or why not?

In the case of perceptual beliefs, at least, our knowledge of the mechanisms that produce them, specifically with respect to their natural limitations under certain conditions – need we revisit the blue/black-white/gold dress debate?[28] – emphatically is thought by most people to impugn the truth of perceptual beliefs under those conditions. Does Plantinga mean to suggest that such qualifications don’t apply to religious beliefs, i.e., that there are no circumstances under which such beliefs should be suspected to be unreliable?

Objection: [I]t might be suggested that the cognitive mechanisms giving rise to religious belief, as opposed to those involved in, for example, perception, are prone to substantial error.[29]

Plantinga: [M]erely finding or possessing a source of religious belief, as with HADD [Hypersensitive Agency Detection Device], does nothing to discredit such belief, and neither does pointing out that the source in question delivers false positives.[30]

Q8: Do you agree with Plantinga’s statement above? Why or why not?

Objection: But wouldn’t this at least show that religious beliefs lack warrant, that property enough of which is what separates knowledge from mere true belief?

Plantinga: Not just as such; after all, even if belief in other minds originates in HADD, we do presumably know that there are other people. What counts here is not the global reliability of the faculty or cognitive mechanism in question, but its reliability in the relevant circumstances.[31]

Plantinga's proper functionalist theory of warrant

Plantinga holds, at a first approximation, that a belief has warrant only if it is produced by cognitive faculties that are functioning properly in an appropriate environment. Plantinga's notion of proper function, moreover, implies the existence of a design plan, and a belief's having warrant requires that the segment of the design plan governing the production of the belief is aimed at truth. In addition, the design plan must be a good one in the sense that the objective probability of the belief's being true (given that it's produced in accordance with the design plan) must be high. The last condition, he says, is the reliabilist constraint on warrant, and “the important truth contained in reliabilist accounts of warrant” (1993b: 17). While it would be an exaggeration to say that Plantinga's theory is “motivated” by problems for reliabilism, he does tout his proper functioning theory in part as an improvement over reliabilism: “what determines whether the output of a process has warrant is not simply … truth-ratios …. [T]he process in question must meet another condition. It must be nonpathological; we might say that the process in question must be one that can be found in cognizers whose cognitive equipment is working properly” (1993a: 208). So, although Plantinga accepts a truth-linked constraint on warrant — namely, high probability of truth — he thinks more must be added.[32]

So then, according to Plantinga,

(1)  If and only if faculty F was designed to track truth, then if F is operating within the appropriate environment, then the beliefs that F delivers have a high probability of being true
(2)  Our epistemic faculties were designed by God to track truth (design assumption)
(3)  But if naturalism is true, then we have no guarantee that our epistemic faculties were designed to track truth
(4)  Therefore, if naturalism is true, then it is not the case that the beliefs delivered by our epistemic faculties are warranted or have a high probability of being true

Objection 1 (Holly M. Smith): Smith asks us to imagine a computer scientist who designs and builds a cognitively sophisticated race of computers, with different hardware than that of humans but the same cognitive properties. According to Plantinga's theory, many beliefs formed by these computers will be warranted, because they result from the proper working of design plans that were aimed at truth. Now suppose, however, that humans were not designed by God, nor by any other designing agent. Then, according Plantinga's ultimate theory, human beliefs are incapable of being warranted. That conclusion, however, is highly counterintuitive. By hypothesis, the human cognitive properties duplicate those of the computers. It is hardly tempting to credit the computers' beliefs with epistemic warrant while refusing to assign the same epistemic credit to human beliefs.[33]

In other words, if ~(2), then our beliefs are not warranted.

Objection 2: A second unattractive feature of Plantinga's theory is the way that it encumbers atheism. At first blush, it seems that atheism should not force one into general skepticism. Theological views should not force one to deny epistemic warrant to all people, including warrant with respect to ordinary physical-object beliefs. Yet if an atheist accepts the (philosophy-of-biology) thesis that no sound naturalistic analysis of proper function is feasible, then he would be forced by Plantinga's account of warrant into general skepticism. Plantinga, of course, would probably welcome this result. But this is a case in which one philosopher's modus ponens is appropriately countered with a modus tollens. In other words, the appropriate conclusion is that Plantinga's account of warrant is misguided.[34]

Q9: What are the “relevant circumstances” Plantinga has in mind under which we should expect religious belief to be warranted? Do you think Plantinga is justified in positing a special faculty, or faculties, for forming religious beliefs? Why or why not?

One further consequence of Plantinga’s account worth mentioning is that you never have a case in which a faculty is operating under the appropriate circumstances (i.e., functioning “properly”) and also produces beliefs that have a low probability of being true. This is contrary to evolutionary theory, which allows for the possibility that our epistemic faculties could have evolved to yield beliefs that have a low probability of being true, provided that the beliefs they yield are still in some way adaptive.

Q10: Do you agree with Plantinga that our epistemic faculties reliably track truth under the appropriate circumstances? Do you think that religious beliefs could be in some sense warranted, but still have a low probability of being true (e.g., in the case that false beliefs about the supernatural might be adaptive)?

Plantinga: What is a religion/science conflict?[36]

à [N]ot just any case of explicit religion/science inconsistency is a genuine case of religion/science conflict. Furthermore, conflict can happen in several different ways. For example,
(1)  a scientific theory might not be explicitly inconsistent with Christian belief, but inconsistent with Christian belief together with propositions that can’t sensibly be rejected.
(2)  A theory might be formally consistent with Christian belief, but still be massively improbable with respect to a set of beliefs or a noetic structure more or less like that of most contemporary Christians, or most contemporary Christians in the Western world (and for that matter, most Christians in the non-Western world).
(3)  A given theory might not be improbable with respect to F and also not improbable with respect to R, but massively improbable with respect to the conjunction of F with R, and hence with respect to a noetic structure that contains both F and R. Such a theory might be so unlikely with respect to such a noetic structure that it wouldn’t be a real candidate for belief.[37]

An example would be a theory entailing that if human beings have come to be by way of natural selection culling genetic variability, then no rational human being knowingly sacrifices her reproductive prospects in favor of advancing someone else’s welfare?[38]

David Sloan Wilson’s “functional interpretation” of religion

I claim that a knowledge of the details [of Calvin’s Geneva] clearly supports a group-level functional interpretation of Calvinism. Calvinism is an interlocking system with a purpose: to unify and coordinate a population of people to achieve a common set of goals by collective action. The goals may be difficult to define precisely, but they certainly included what Durkheim referred to as secular utility – the basic goods and services that all people need and want, inside and outside of religion.[39]

Plantinga: This sounds a bit as if [Wilson] thinks of Calvinism as a project or activity that people undertake in order to achieve a common set of goals, these goals including at least that secular utility of which he speaks. If this is what he means, he would be wrong: Calvin and the other Calvinists weren’t (and aren’t) embracing Calvinism in order to achieve some kind of secular utility. In fact it is doubtful that Calvinism, or Roman Catholicism, or Christianity or for that matter Judaism or Islam are (wholly) intentional activities in that way at all.[40]

Plantinga seems to want to defend against evolutionary accounts of religion by demonstrating that many of their central features don’t perform any evolutionarily valuable function. For Plantinga, asking the purpose in believing the doctrines of my faith is like asking me the purpose in believing that I live in Michigan or that 7+5=12.[41]

[I]t’s not clear that there is some purpose for the sake of which one undertakes to love God: you love God because he is attractive, such as to attract or compel love. Christians pray because it seems the right thing to do, or because they are instructed to pray, and how to pray, by Jesus Christ. The same holds for worship. When worship is going properly it isn’t something done in order to achieve some end outside itself: it is much more spontaneous and immediate than that, and you participate just because it seems right and appropriate…What is clear, however, is that there isn’t any goal or purpose or end involved, typically, in accepting the central tenets of Calvinism or Christianity, and even if there is a purpose or goal or end involved in worship and prayer, it most certainly is not the achievement of the secular goods Wilson mentions.[42]

Q11: Is Plantinga conflating the notions of ultimate and proximate causation? Wilson’s claim seems to be that these purposes, so to speak, were the ultimate (i.e., evolutionary) cause of Calvinist doctrine. As such, they are not taken to be conscious or intentional, or for that matter transparent to observation.[43]

à Plantinga acknowledges this point later on p. 152.

Freud: The function or purpose of religious belief is really to enable believers to carry on in this cold and hostile or at any rate indifferent world in which we find ourselves. The idea is that theistic belief arises from a psychological mechanism Freud calls “wish-fulfillment”; the wish in this case is father, not to the deed, but to the belief…This illusion enables us to carry on and survive: therefore it contributes to our fitness.[44]

[T]he processes in question don’t seem to have as their function the production of true beliefs. Rather, they produce beliefs that in the context are useful in one way or another. And exactly this is the way things stand with Freud’s explanation: an essential part of his account of theistic belief is that it is not produced by truth-aimed cognitive processes, but by a process with a different sort of function. At this point the Christian or any serious theist will disagree with him. The serious theist will think that God has created us in such a way that we come to know him; and the function of the cognitive processes, whatever they are, that ordinarily produce belief in God in us is to provide us with true belief. So even if she agrees with Freud that theistic belief arises from wish-fulfillment, she will think that this particular instance of wish fulfillment is truth-aimed; it is God’s way of getting us to see that he is in fact present and in fact cares for us.[45]

Wilson: The role of [religious] belief is not to reflect reality, he says, but to play a part in the production of what religion produces. As he says, “our challenge is to interpret the concept of God and his relationship with people as an elaborate belief system designed to motivate the behaviors listed.”[46]

Q12: Plantinga says that serious theists cannot accept that our epistemic faculties were built to the specifications of adaptiveness rather than truth. Do you agree with him? Why or why not?

Q13: Is the question of whether our epistemic faculties are truth-oriented or more broadly adaptive one that can be settled by evaluation of the evidence? If so, which hypothesis is most strongly supported by the empirical evidence? What empirical predictions does each respective hypothesis make that might allow us to verify or disconfirm them?

III. Historical Biblical Criticism

A. Traditional Biblical Commentary

Traditional Biblical Commentary –

[C]lassical Christians take the Bible to be authoritative in one way or another. That is because they think of the Bible as a special word from the Lord; as they see it, God is the principal and ultimate author of the Bible. Of course, the Bible is also a library, each of its books has a human author. But God has used these authors in such a way that what they write has the divine stamp of approval; hence the Bible – the whole Bible – is divinely inspired in such a way that its principle [sic] author is God. The Bible is a library, but it also like a single book in that it has a single principal author…[T]he chief function of the Bible is to disclose to mankind God’s gospel – the good news of salvation through the life and death and resurrection of Jesus Christ, himself both a human being but also the divine son of God, the second person of the trinity. Now what the Lord teaches is of course trustworthy; therefore this entire book, so Christians think, is authoritative.[47]

Plantinga: How does this work? Just how did this inspiration happen? Just how can it be said that the Bible is divine discourse[48]

The aim of [Biblical commentary] is to discover what God is teaching in a given passage, and to do so in light of these assumptions; the aim is not to determine whether what is taught it true, or plausible, or well supported by arguments…[These questions are] not appropriate in traditional Biblical commentary. Once you have established, as you think, what God is teaching in a given passage, what he is proposing for our belief, that settles the matter. You do not go on to ask whether it is true, or plausible, or whether a good case for it has been made. God is not required to make a case.[49]

Q14: While you may agree that “God is not required to make a case” in support of the truth or plausibility of the things he has taught, isn’t the skeptic nonetheless justified in challenging Christians about whether God has in fact taught these things? Do you think the case for divine authorship of the Bible is sufficient to block skeptical challenges like those presented above?

B. Historical Biblical Criticism

Historical Biblical Criticism (HBC) –

In pursuing this project, one doesn’t assume that the Bible is specially inspired by God, or that it contains anything like specifically divine discourse. Nor does one assume the main lines of Christian belief – that Jesus Christ is the divine son of God, for example, or that he arose from the dead, or that his suffering and death is in some way an atonement for human sin. Instead, you prescind from all of these theological beliefs; you bracket them; you set them aside for the purpose of the inquiry in question.[50]

Plantinga: The point here is precisely this effort to be scientific. Traditional biblical commentary is not scientific, so the claim goes, exactly because it proceeds on the basis of the assumption I mentioned above; HBC, therefore eschews these assumptions in its effort to be scientific.[51]

Reason – Includes the cognitive faculties that are employed in everyday life and ordinary history and science:
  • Perception
  • Testimony
  • A priori intuition
  • Deductive reasoning
  • Probabilistic reasoning[52]
Faith – Includes that faculty, or faculties, that are employed in religious contexts in order to yield religious beliefs.

Q15: What does Plantinga mean by “deliverances of faith.”[53] Is faith supposed to be an additional source of knowledge, something that accesses or receives truths inaccessible via the better-known faculties of reason?

Troeltschian HBC – implies that proper scripture scholarship proceeds on the assumption that God never does anything specially, in particular there are no miracles, and God neither raised Jesus from the dead nor specially inspired the Biblical authors.[54]

Duhemian HBC – takes as a guiding principle, not that God never does anything special, but that the proper procedure, in scripture scholarship, is to use as evidence only what would be acceptable to everyone (or nearly everyone) who is party to the project.[55]

Q16: What do you think is the appropriate way to engage the text of the Bible, and why?  

Plantinga: Suppose you are a classical Christian, accepting, for example, the whole of the Apostle’s Creed. Suppose you are also, as I believe Christians should be, wholly enthusiastic about science; you believe that it is a magnificent display of the image of God in which humanity has been created. Still further, suppose you see both evolutionary psychology and HBC as proper science. How then should you think about the negative results coming from these scientific enterprises? In particular, do they provide or constitute defeaters for the beliefs with which they are in conflict? That is, do they give you a good reason to reject those beliefs, or at any rate hold them less firmly?[56]

à To be picked up in chapter 6.

Other resources:
(2)  SEP article on reliabilism - http://plato.stanford.edu/entries/reliabilism/
(3)  Wikipedia article on Alvin Plantinga; see sect. 2.2 “Reformed epistemology” – http://en.wikipedia.org/wiki/Alvin_Plantinga

Reformed epistemology

Plantinga's contributions to epistemology include an argument which he dubs "Reformed epistemology". According to Reformed epistemology, belief in God can be rational and justified even without arguments or evidence for the existence of God. More specifically, Plantinga argues that belief in God is properly basic, and due to a religious externalist epistemology, he claims belief in God could be justified independently of evidence. His externalist epistemology, called "Proper functionalism", is a form of epistemological reliabilism.

Plantinga discusses his view of Reformed epistemology and Proper functionalism in a three-volume series. In the first book of the trilogy, Warrant: The Current Debate, Plantinga introduces, analyzes, and criticizes 20th-century developments in analytic epistemology, particularly the works of Chisholm, BonJour, Alston, Goldman, and others. In the book, Plantinga argues specifically that the theories of what he calls “warrant”- what many others have called justification - put forth by these epistemologists have systematically failed to capture in full what is required for knowledge.

In the second book, Warrant and Proper Function, he introduces the notion of warrant as an alternative to justification and discusses topics like self-knowledge, memories, perception, and probability. Plantinga's "proper function" account argues that as a necessary condition of having warrant, one's "belief-forming and belief-maintaining apparatus of powers" are functioning properly—"working the way it ought to work". Plantinga explains his argument for proper function with reference to a "design plan", as well as an environment in which one's cognitive equipment is optimal for use. Plantinga asserts that the design plan does not require a designer: "it is perhaps possible that evolution (undirected by God or anyone else) has somehow furnished us with our design plans", but the paradigm case of a design plan is like a technological product designed by a human being (like a radio or a wheel). Ultimately, Plantinga argues that epistemological naturalism- i.e. epistemology that holds that warrant is dependent on natural faculties – is best supported by supernaturalist metaphysics – in this case the belief in a creator God or designer who has laid out a design plan that includes cognitive faculties conducive to attaining knowledge.

According to Plantinga, a belief, B, is warranted if:
(1)  the cognitive faculties involved in the production of B are functioning properly…;
(2)  your cognitive environment is sufficiently similar to the one for which your cognitive faculties are designed;
(3)  … the design plan governing the production of the belief in question involves, as purpose or function, the production of true beliefs…; and
(4)  the design plan is a good one: that is, there is a high statistical or objective probability that a belief produced in accordance with the relevant segment of the design plan in that sort of environment is true.

Plantinga seeks to defend this view of proper function against alternative views of proper function proposed by other philosophers which he groups together as "naturalistic", including the "functional generalization" view of John Pollock, the evolutionary/etiological account provided by Ruth Millikan, and a dispositional view held by John Bigelow and Robert Pargetter. Plantinga also discusses his evolutionary argument against naturalism in the later chapters of Warrant and Proper Function.

In 2000, the third volume, Warranted Christian Belief, was published. Plantinga reintroduces his theory of warrant to ask whether Christian theistic belief can enjoy warrant. He argues that this is plausible. Notably, the book does not address whether or not Christian theism is true.[57]



[1] P. 134.
[2] P. 135.
[3] The Art Instinct, 90-91.
[4] The Art Instinct, 91.
[5] P. 135.
[6] P. 136.
[7] P. 137.
[10] The Art Instinct, 102.
[11] Cite the example of the hypothesis that says we have evolved to perceive a passerby as more attractive on first glance than he/she would be on more careful inspection because of the superior utility of not missing an opportunity to mate with a “rare beauty.” The only problem is that the situation under which this “adaptation” would have been useful, namely the crowded streets of a big city, fails to correspond to the Pleistocene environment, in which societies were small (maxing out at about 300) and relatively stable over time.
[13] P. 138.
[14] P. 138-139.
[15] P. 139.
[16] P. 140.
[18] P. 141.
[19] P. 141-142.
[20] P. 142.
[21] P. 143.
[22] P. 143,
[23] P. 147.
[24] P. 146.
[25] P. 146.
[26] P. 146.
[27] P. 144
[29] P. 145.
[30] P. 145.
[31] P. 145, from footnote.
[33] Ibid.
[34] ibid.
[36] p. 147.
[37] P. 148.
[38] P. 148-149.
[39] P. 150.
[40] P. 150.
[41] P. 151.
[42] P. 151.
[43] See http://en.wikipedia.org/wiki/Proximate_and_ultimate_causation for an explanation of what distinguishes the concepts of ultimate and proximate causation.
[44] P. 152-153.
[45] P. 154-155.
[46] P. 155.
[47] P. 157.
[48] P. 157.
[49] P. 159.
[50] P. 159.
[51] P. 160.
[52] P. 160.
[53] P. 160.
[54] P. 162-163.
[55] P. 163.
[56] P. 165.