Plantinga pulls a Samson

Alvin Plantinga throws out a nearly adorable argument against naturalism, or reductionism, in the July/August 2008 issue of Books & Culture. It is quite a straightforward move, almost syllogistic, and it goes like this: "Naturalists say that science proves their position, and in particular evolution. Plantinga disagrees. “Evolution and naturalism are not merely uneasy bedfellows,” he writes. “One can’t rationally be an evolutionary naturalist.” Now why does he say this?

Here’s the critique: if the mind has arrived by means of evolutionary processes, forces conditioned by history and the larger cosmological context, then how do we know that what it thinks is true is true? Plantinga quotes Darwin:

With me the horrid doubt always arises whether the convictions of a man’s mind, which has been developed from the mind of the lower animals, are of any value or at all trustworthy. Would anyone trust in the convictions of a monkey’s mind, if there are any convictions in such a mind?[1]

He goes on to say that for the naturalist, beliefs, along with other mental states, are caused by neurophysiology. And evolution says that this equipment has been adapted, and is still adaptive for the purpose of genetic reproduction. I like his quote from Francis Crick, “Our highly developed brains . . . were not evolved under the pressure of discovering scientific truth, but only to enable us to be clever enough to survive and leave descendents” (from The Astonishing Hypothesis). Natural selection doesn’t care about truth, it cares about sex, and if false beliefs mean more sex, then that is fine.

Plantinga, with the help of a math buddy, asks, then, what is the chance that any one proposition is true? Out of one hundred beliefs, how many will be false and how many will be true. Answer: not even a handful, and there’s no way to tell one way or the other.

Evolutionary naturalism, then, is self-refuting. Or, as he says, “One who accepts evolutionary naturalism has a defeater for the belief that her cognitive faculties are reliable: a reason for giving up that belief, for rejecting it, for no longer holding it.” What this means is that evolution spoils naturalism of its epistemological power. The reductionist is the one in danger of falling into an unholy skepticism (although Plantinga points out that Aristotle, the Stoics, and Hegel managed to be atheists without simultaneously embracing naturalism.) And what about the Christian? Well, is there any need to explain it? Get thee, saint, to Augustine and read his de Magistro, and get thee to the imago Dei, the doctrine of the logos, of creation, and of general revelation.

POSTSCRIPT: August 2019

Discussing the hypothesis of emergence, author Russell Howell writes, "This approach has been debated extensively. For example, Alvin Plantinga's celebrated essay, "An Evolutionary Argument against Naturalism"[2] claims that rationality is very unlikely a quality produced by survivability. Plantinga's approach, as he acknowledges, is similar to that found in C. S. Lewis's Miracles. (Lewis's argument, incidentally, was recently enhanced by Victor Reppert in his book C. S. Lewis's Dangerous Idea.) The thrust of their thinking here is that you cannot get (or are very unlikely to get) rationality out of a causally closed system that works solely on the basis of blind chance physical interactions operating in accordance with a "survival of the fittest" paradigm.[3] (cf Pattern 83: Opening a Closed Circle.)

[1] Letter to William Graham (Down, July 3, 1881, in The Life and Letters of Charles Darwin, ed. Francis Darwin (London: John Murray, 1887), Volume 1, pp. 315-16. "The eternal mystery of the world is its comprehensibility." ~ Albert Einstein

[2] This essay has appeared in various forms. See, for example, Alvin Plantinga, Warrant and Proper Function, (Oxford: Oxford University Press, 1993), Chapter 12. Fruitful research can be made in to the Naturalism debate between C. S. Lewis and G. E. M. Anscombe. Considered along a timeline, Plantinga's argument is either a repetition of or a development of the Argument from Reason. See Lewis's Miracles at http://stefangillies.wordpress.com/c-s-lewis-2/

[3] Russell W. Howell "Does Mathematical Beauty Pose problems for Naturalism?" Christian Scholar's Review 35:4 (Summer 2006): 498-499. Also Pascal Boyer, Religion Explained: The Evolutionary Origins of Religious Thought (New York, NY: Basic Books, 2001). Howell: "Any theory that would combine evolutionary explanations for rationality with naturalism "would still run up against the arguments of Mark Steiner . . . Strictly speaking, Steiner's argument attempts to refute "non-anthropocentrism" rather than naturalism. But if Steiner is correct, the naturalist should not take comfort. For any form of naturalism, Steiner muses, is ipso facto non-anthropocentric, n that it would disallow a privileged status for humans in the scope of the universe. If, as Steiner argues, the success of mathematics can be shown to put humans in some sort of privileged position, then naturalism has some problems to sort out. . . . mathematicians and scientist . . . rely on human notions of beauty and symmetry in the development of their theories. In fact, such activity has been a longstanding and consistent strategy" (500).