How could unbelievers, unbelievers just because they have already rejected God’s revelation in the universe about them and within them by a philosophy of chance and of human autonomy, ever concede that the claims of the New Testament writers with respect to their inspiration by God is true? The criterion they employ will compel them to deny it. It is their criterion that must be shown to involve a metaphysics of chance. Then, if the Spirit opens their eyes, they will see the truth.
… Christ does ask the natural man to judge with respect to the truth of his claims. But then he asks them to admit that their own wisdom has been made foolishness with God. Only the Christian theory of knowledge, based as it is upon the absolute authority of the Word of God speaking in Scripture, makes communication of any sort possible anywhere between men. Without this presupposition men would have no integrated selves and the world would be a vacuum. Without this presupposition of the Christian theory of being there would be no defensible position with respect to the relation of men and things. Neither men nor things would have discernible identity. There would be no science and no philosophy or theology, for there would be no order. History would be utterly unintelligible. Finally, without the presupposition of the Christian theory of morality there would be no intelligible view of the difference between good and evil. Why should any action be thought to be better than any other except on the supposition that it is or is not what God approves or disapproves? Except on the Christian basis there is no intelligible distinction between good and evil.
– Cornelius Van Til, The Protestant Doctrine of Scripture p.61-62