Say what you will of fortitude, but show me the man who can patiently endure the laughter of fools when they have obtained an advantage over him. 'Tis only when their nonsense is without foundation that one can suffer it without complaint.

Paternity is based anyhow only upon conviction: I am convinced, therefore, I am the father.

Insofar as he makes use of his healthy senses, man himself is the best and most exact scientific instrument possible. The greatest misfortune of modern physics is that its experiments have been set apart from man, as it were, physics refuses to recognize nature in anything not shown by artificial instruments, and even uses this as a measure of its accomplishments.

This is the true measure of love, When we believe that we alone can love, That no one could ever have loved so before us, And that no one will ever love in the same way after us.

True art can only spring from the intimate linking of the serious and the playful.

Napoleon for the sake of a good name broke in pieces half the world.

Life is not anything, but an opportunity for something.