I see myself immersed in the depths of human existence and standing in the face of the ineffable mystery of the world and of all that is. And in that situation, I am made poignantly and burningly aware that the world cannot be self-sufficient, that there is hidden in some still greater depth a mysterious, transcendent meaning. This meaning is called God. Men have not been able to find a loftier name, although they have abused it to the extent of making it almost unutterable. God can be denied only on the surface; but he cannot be denied where human experience reaches down beneath the surface of flat, vapid, commonplace existence.
As translated in In Love with Eternity: Philosophical Essays and Fragments