Idolatrous Reference Point
When man became a sinner he made of himself instead of God the ultimate or final reference point. And it is precisely this presupposition, as it controls without exception all forms of non-Christian philosophy, that must be brought into question. If this presupposition is left unquestioned in any field all the facts and arguments presented to the unbeliever will be made over by him according to his pattern. The sinner has cemented colored glasses to his eyes which he cannot remove. And all is yellow to the jaundiced eye. There can be no intelligible reasoning unless those who reason together understand what they mean by their words. In not challenging this basic presupposition with respect to himself as the final reference point in predication the natural man may accept the “theistic proofs” as fully valid. He may construct such proofs. He has constructed such proofs. But the god whose existence he proves to himself in this way is always a god who is something other than the self-contained ontological trinity of Scripture. The Roman Catholic apologete does not want to prove the existence of this sort of God. He wants to prove the existence of such a God as will leave intact the autonomy of man to at least some extent. Rome’s theology does not want a God whose counsel controls whatsoever comes to pass.
Cornelius Van Til, The Defense of the Faith (The Presbyterian and Reformed Publishing Company: Philadelphia, 1955), 94–95