“A leader is a person you will follow to a place you would not go by yourself.”

“Don't be too timid and squeamish about your actions. All life is an experiment.”

“I met in the street a very poor young man who was in love. His hat was old, his coat worn, his cloak was out at the elbows, the water passed through his shoes, - and the stars through his soul.”

“Science is properly more scrupulous than dogma. Dogma gives a charter to mistake, but the very breath of science is a contest with mistake, and must keep the conscience alive.”

“God not only plays dice, but also sometimes throws them where they cannot be seen.”

“Be grateful for luck, but don't depend on it.”