The laws of gravity cannot be held responcible for people falling in love.

Peace cannot be kept by force. It can only be achieved by understanding. You cannot subjugate a nation forcibly unless you wipe out every man, woman, and child. Unless you wish to use such drastic measures, you must find a way of settling your disputes without resort to arms.

Something deeply hidden had to be behind things.

Everything has changed except the way man thinks (when the hydrogen bomb was exploded)

We must learn to see the world anew.

The height of stupidity is most clearly demonstrated by the individual who ridicules something he knows nothing about.

When forced to summarize the general theory of relativity in one sentence: Time and space and gravitation have no separate existence from matter.