Stress has been laid on the fact that the Bible speaks of the Word of God as self-contained. That is, the Bible is the Word of him who, as Creator-Redeemer alone can identify himself. God in Christ identifies himself in terms of himself because he exists exclusively in terms of himself. There is no non-being over against him that influences him. There are no laws of logic above him according to which he must measure his own internal consistency. This God of the Bible is, therefore, the final reference point for predication of his rational creatures. They, and with them all things in the universe, must be explained in terms of him, and he is never wholly comprehensible to them. Therefore no fact in the universe is ever wholly comprehensible to them.
They therefore need to live by authority. They have to be told who they are and what the things of the universe mean in relation to themselves and finally in relation to God. God’s supernatural revelation is presupposed in all successful rational inquiry on the part of man.
– Cornelius Van Til, A Christian Theory of Knowledge p.41