Good acts are like good poems. One may easily get their drift, but they are not rationally understood.

I shall never believe that God plays dice with the world.

I believe in intuition and inspiration. Imagination is more important than knowledge. For knowledge is limited, whereas imagination embraces the entire world, stimulating progress, giving birth to evolution. It is, strictly speaking, a real factor in scientific research.

You can never solve a problem on the level on which it was created. Insanity: doing the same thing over and over again and expecting different results. A life lived for others is a life worthwhile.

You think you have troubles with mathematics . . . I assure you mine are still bigger.

It is not by sitting still at a grand distance and calling the human race larvae that men are to be helped.

I think we have to safeguard ourselves against people who are a menace to others, quite apart from what may have motivated their deeds.