Success is a lousy teacher. It seduces smart people into thinking they can't lose.

It is not clear that intelligence has any long-term survival value.

Intelligence is the ability to adapt to change.

It is always wise to look ahead, but difficult to look further than you can see.

Thousands of candles can be lighted from a single candle, and the life of the candle will not be shortened. Happiness never decreases by being shared.

I can accept failure, everyone fails at something. But I can't accept not trying.

All the great things are simple, and many can be expressed in a single word: freedom, justice, honor, duty, mercy, hope.

Someone told me that each equation I included in the book would halve the sales.

I have no special talent. I am only passionately curious.

The true sign of intelligence is not knowledge but imagination.