The non-regenerate man seeks by all means to “keep under” this remnant of a true theistic interpretation that lingers in his mind. His real interpretative principle, now that he is a covenant-breaker, is that of himself as ultimate and of impersonal laws as ultimate. It is he himself as ultimate, by means of laws of logic that operate independently of God, who determines what is possible and probable. To the extent, then, that he proceeds self-consciously from his own principle of interpretation, he holds the very existence of God, and of the creation of the universe, to be not merely improbable, but impossible. In doing so he sins, to be sure, against his better knowledge. He sins against that which is hidden deep down in his own consciousness. And it is well that we should appeal to this fact. But in order to appeal to this fact we must use all caution not to obscure this fact. And obscure it we do if we speak of the “common consciousness” of man without distinguishing clearly between what is hidden deep down in the mind of natural man as the revelation and knowledge of God within him and what, in rejecting God, he has virtually adopted as being his final interpretative principle.
– Cornelius Van Til, An Introduction to Systematic Theology p.82-83