"What is important in life is life, and not the result of life."

"Grau, teurer Freund, ist alle Theorie, und grün des Lebens goldner Baum."

"A man should hear a little music, read a little poetry, and see a fine picture every day of his life, in order that worldly cares may not obliterate the sense of the beautiful which God has implanted …"

"Doubt grows with knowledge."

"Man is made to suffer. He is not a god, but a worm."