« If a dog jumps in your lap, it is because he is fond of you; but if a cat does the same thing, it is because your lap is warmer. »

« Use your imagination not to scare yourself to death but to inspire yourself to life. »

« To know oneself is to study oneself in action with another person. »

« If you want to be free, there is but one way; it is to guarantee an equally full measure of liberty to all your neighbors. There is no other. »

« What is most beautiful in virile men is something feminine; what is most beautiful in feminine women is something masculine. »

« It is only the great men who are truly obscene. If they had not dared to be obscene, they could never have dared to be great. »

« Men, it has been well said, think in herds; it will be seen that they go mad in herds, while they only recover their senses slowly, and one by one. »

« Nothing shocks me. I’m a scientist. »

« Today’s scientists have substituted mathematics for experiments, and they wander off through equation after equation, and eventually build a structure which has no relation to reality. »

« Work is not always required… there is such a thing as sacred idleness, the cultivation of which is now fearfully neglected. »