The important thing is not to stop questioning. Curiosity has its own reason for existing. One cannot help but be in awe when he contemplates the mysteries of eternity, of life, of the marvelous structure of reality. It is enough if one tries merely to comprehend a little of this mystery every day. Never lose a holy curiosity.

I speak to everyone in the same way, whether he is the garbage man or the president of the university.

Man's will, sustained by an indominable conviction, is much more powerful than material forces that seem insurmountable.

Anger dwells only in the bosom of fools.

Most people say that it is the intellect which makes a great scientist. They are wrong: it is character.

One thing I have learned in a long life: that all our science, measured against reality, is primitive and childlike -- and yet it is the most precious thing we have.

The most beautiful thing we can experience is the mysterious. It is the source of all true art and science.