The Epistemological Commitments of Philosophical Naturalists
The Epistemological Commitments of Philosophical Naturalists
I have delineated the metaphysical commitments of those who deny that the mental is basic to the universe. At the same time atheists like Richard Dawkins are not philosophical skeptics. They hold that there is genuine knowledge, discovered by science. They are scientific realists who believe that science discovers the truth about the way reality is. That is why they object, for example, to religious believers who hold to theism as true and thus broadly informative about the nature of reality, including the natural world. They think science has discovered that evolution is true and creationism is false. They think physicists discover the truth, which means they believe that physicists make correct mathematical inferences. They think we literally add, subtract, multiply, divide, square, and take square roots of numbers.
In a recent paper William Hasker has recommended that the Argument from Reason be presented as a transcendental argument which identifies the necessary presuppositions of the fact of scientific inference and goes from there to draw the implications of these. He writes:
The objection is not merely that naturalism has not yet produced an explanation of rational inference and the like, as though this were a deficiency that could be remedied by another decade or so of scientific research. The problem is that the naturalist is committed to certain assumptions that preclude in principle any explanation of the sort required. The key assumptions are three in number: mechanism (the view that fundamental physical explanations are nonteleological), the causal closure of the physical domain, and the supervenience of the mental on the physical. So long as these assumptions remain, no amount of ingenious computer modeling can possibly fill the explanatory gap. In order to bring out this feature of the situation, I propose that the first two stages of the Argument from Reason are best viewed as a transcendental argument in roughly the Kantian sense: They specify the conditions which are required for experience of a certain sort to be possible—in this case the kind of experience found in the performance of rational inference.3
Consider the following list of presuppositions of reason. These presuppositions have transcendental justifications. The justification goes from the fact that at least one person has made a rational inference (such as a mathematical calculation) and establishes that these conditions must obtain if that rational inference has taken place.
Unless all of these statements are true, it is incoherent to argue that one should accept naturalism based on evidence of any kind. Nor would it be possible to accept the claim that one should accept evolution as opposed to creationism because there is so much evidence for evolution. Nor could one argue that one should be supremely confident that use of the scientific method will result in an accurate understanding of reality. Unless all these statements are true, there are no scientists, and no one is using the scientific method.
To see how the transcendental justification works, consider the possibility that reality consists of nothing but a turnip with whipped cream on top. Of course this flies in the face of all the empirical evidence, but we can argue further that if this were so, no one would be able to reason to that conclusion. Given the way this argument is structured, one could not use the Paradigm Case argument to argue that since there has to be a contrast between valid and invalid inference, inference would also have to be possible in the turnip world. No, the fact that we can make such a distinction provides a transcendental basis for believing that we do not live in the turnip world.