“Reformed theology holds to the self-sufficiency of God without compromise. It therefore rejects every form of human autonomy. Only on the assumptions of divine self-sufficiency and man’s complete dependence upon God can the difference between the Christian and the non-Christian points of view be clearly made out. Only thus can the issue be clearly drawn. The non-Christian assumes that man is ultimate, that is, that he is not created. Christianity assumes that man is created. The non-Christian assumes that the facts of man’s environment are not created; the Christian assumes that these facts are created. The Christian has derived his convictions on these matters from Scripture as the infallible Word of God. As self-explanatory, God naturally speaks with absolute authority. It is Christ as God who speaks in the Bible. Therefore the Bible does not appeal to human reason as ultimate in order to justify what it says. It comes to the human being with absolute authority. Its claim is that human reason must itself be taken in the sense in which Scripture takes it, namely, as created by God and as therefore properly subject to the authority of God.”
– Cornelius Van Til, A Christian Theory of Knowledge p.14-15
In the first place it must be affirmed that a Protestant accepts Scripture to be that which Scripture itself says it is on its own authority. Scripture presents itself as being the only light in terms of which the truth about facts and their relations can be discovered. Perhaps the relationship of the sun to our earth and the objects that constitute it, may make this clear. We do not use candles, or electric lights in order to discover whether the light and the energy of the sun exist. The reverse is the case. We have light in candles and electric light bulbs because of the light and energy of the sun. So we cannot subject the authoritative pronouncements of Scripture about reality to the scrutiny of reason because it is reason itself that learns of its proper function from Scripture.
– Cornelius Van Til, The Defense of the Faith p.130
The Bible is thought of as authoritative on everything of which it speaks. Moreover, it speaks of everything. We do not mean that it speaks of football games, of atoms, etc., directly, but we do mean that it speaks of everything either directly or by implication. It tells us not only of the Christ and his work, but it also tells us who God is and where the universe about us has come from. It tells us about theism as well as about Christianity. It gives us a philosophy of history as well as history. Moreover, the information on these subjects is woven into an inextricable whole. It is only if you reject the Bible as the word of God that you can separate the so-called religious and moral instruction of the Bible from what it says, e.g., about the physical universe.
– Cornelius Van Til, Christian Apologetics p.19
(The Defense of the Faith p.29)