"When one admits that nothing is certain one must, I think, also admit that some things are much more nearly certain than others."

"The main things which seem to me important on their own account, and not merely as means to other things, are knowledge, art, instinctive happiness, and relations of friendship or affection."

"It is a waste of energy to be angry with a man who behaves badly, just as it is to be angry with a car that won't go."

"There are two motives for reading a book: one, that you enjoy it; the other, that you can boast about it."

"Science may set limits to knowledge, but should not set limits to imagination."

"The greatest challenge to any thinker is stating the problem in a way that will allow a solution."

"Those who educate children well are more to be honored than parents, for these only gave life, those the art of living well."

"Every small, positive change we make in ourselves repays us in confidence in the future."

"We must dare to think about 'unthinkable things' because when things become 'unthinkable' thinking stops and action becomes mindless."

"I believe in one thing only, the power of the human will."

"Death is not extinguishing the light; it is putting out the lamp because the Dawn has come."

"The successful revolutionary is a statesman, the unsuccessful one a criminal."