The “natural man” assumes that there is a “principle of rationality,” including the laws of logic, i.e. the law of identity, the law of excluded middle and the law of contradiction which is, like the “facts,” just there. The facts he speaks of he assumes to be non-created facts. There is no “curse” that rests upon nature because of man’s sin. The “natural man” assumes that he himself, being “just there,” can relate the space-time facts which are “just there” by means of a “principle of rationality” that is “just there” to one another or that if he cannot do this, no one can. It does not occur to him to think of God as the one whose thoughts are higher than his thoughts. How do I, as a Christian, know all this information about the “natural man.” Christ tells me this in Scripture. Moreover, the regenerating work of the Holy Spirit gives me life from the dead so that I understand this not merely in intellectual fashion but existentially, I have been born again unto knowledge. Once I am born again I know that I am a creature made in the image of God. I now know that together with all men I became a sinner, a covenant-breaker, subject to the wrath of God. I now know that Christ died to redeem me from the curse that rested upon me for my disobedience of the law of God and that in him I am now justified. I know that I am, together with the body of the redeemed, on the way to my Savior’s presence. In the words of the Heidelberg Catechism I am now persuaded that “I belong, not to myself, but to my faithful Savior and that without the will of my heavenly Father not a hair shall fall from my head.” Everything in the I-it dimension as well as everything in the I-thou dimension is unified by means of the all-directing control of Jesus Christ, the Savior of his people. The city of God will be victorious over the city of men. The powers of hell cannot prevent the victory of the work of the triune God for the salvation of the world.
-Cornelius Van Til, Excerpted from a Letter to Francis Schaeffer (Source)
UPDATE: Every time I read this quote, I like it even more! So much good here.