A thought, even a possibility, can shatter and transform us.

You say a good cause justifies any war; but I say a good war justifies any cause.

Do you believe then that the sciences would ever have arisen and become great if there had not before hand been magicians, alchemists, astrologers and wizards, who thirsted and hungered after abscondite and forbidden powers?

Against boredom even gods struggle in vain.

When marrying, ask yourself this question: Do you believe that you will be able to converse well with this person into your old age? Everything else in marriage is transitory.

The last Christian died on a cross.

Art is the highest task and the proper metaphysical activity of this life.