Every need whose true satisfaction is denied leads by necessity to faith.

Life teaches us to be less harsh with ourselves and with others.

Since I have heard often enough that everyone in the end has his own religion, nothing seemed more natural to me than to fashion my own.

Can a sparrow know how a stork feels?

The safest thing is always to try to convert everything that is in us and around us into action; let the others talk and argue about it as they please.

The history of science is science itself; the history of the individual, the individual.

Ambition and love are the wings of great actions.