If a man's honesty were called into question, it would be ridiculous to refer to the man's own word, whether he be honest or not. The same absurdity there is in attempting to prove, by any kind of reasoning, probable or demonstrative, that our reason is not fallacious, since the very point in question is, whether reasoning may be trusted.
The argument concludes that the conjunction of naturalism with the theory of evolution cannot rationally be accepted—at any rate by someone who is apprised of this argument and sees the connection between
N&
E and
R.
Religion and Science (Stanford Encyclopedia of Philosophy)