When you stop learning, stop listening, stop looking and asking questions, always new questions, then it is time to die.

To believe in something not yet proved and to underwrite it with our lives: it is the only way we can leave the future open. Man, surrounded by facts, permitting himself no surmise, no intuitive flash, no great hypothesis, no risk, is in a locked cell. Ignorance cannot seal the mind and imagination more surely.

To believe in something not yet proved and to underwrite it with our lives: It is the only way we can leave the future open.

I broke every barrier I could to see things as they are.

Segregation is evil; there is no pattern of life which can dehumanize men as can the way of segregation.

Faith and doubt both are needed - not as antagonists, but working side by side to take us around the unknown curve.

The question in crisis or ordeal is not: Are you going to be an extremist? The question is: What kind of extremist are you going to be?