Just supposing for the sake of the argument that there is a being of such a kind as that He may with any propriety be called "God", it does seem antecedently very improbable that weak and limited creatures of a day, such as we are, should discover Him by our own efforts.... who could be discovered in that way would hardly be worth discovering. I think we ought to stick to that principle rather firmly. I think we ought to be rather sure that we cannot know God unless God has been pleased to reveal Himself to us.
John Gresham Machen
Men have gone on to build up vast intellectual schemes, philosophies, and theologies, to prove that ideals are not real as ideals but as antecedently existing actualities. They have failed to see that in converting moral realities into matters of intellectual assent they have evinced lack of moral faith.