According to Calvin, God’s revelation to man is always and everywhere clear. It is sin that makes men pervert the revelation of God. It is because men are sinners that their “theology” is evil. Sin makes man spurn the love of God and merit his wrath, thus every man, says Calvin, is walking in the way of death. His is a downward journey on the staircase that leads to eternal separation form God. But God in his grace has sent his Son, our Lord Jesus Christ, to be the redeemer of the world. He himself tells us about his work of redemption. He who knew no sin was made sin for us that we might be made the righteousness of God in him. He gives us his Spirit so that, though of ourselves we would spurn this redemption, he enlightens our minds and quickens our hearts to receive it. Thus redemptive revelation, as well as foundational revelation, is self-authenticating. We must take Christ at his word. If we do so, then our reason will truly be set free. Then we can anew enter upon the task of glorifying God in science and in art, in philosophy and in worship. And then we are on the staircase that leads to his presence in glory forevermore.
– Cornelius Van Til, The Case for Calvinism p.23