"The greatest danger for man, in the whole of his life, is to lose himself, to lose his own self."

"If I am to love God, I must be able to recognize him; if I am to recognize him, then he must be visible; if he is visible, then he is not God."

"The most tremendous energy of which the world is capable is the spiritual energy of a man who is in despair."

"The aesthetic is that which is immediately perceived, the ethical is that which is chosen, and the religious is that which is believed."

"Life can only be understood backwards; but it must be lived forwards."