The bigotry of the nonbeliever is for me nearly as funny as the bigotry of the believer.

Physical concepts are free creations of the human mind, and are not, however it may seem, uniquely determined by the external world.

Why does this magnificent applied science which saves work and makes life easier bring us so little happiness? ... The simple answer runs: 'Because we have not yet learned to make sensible use of it.'

The thing is, not to stop questioning.

The release of atomic energy has not created a new problem. It has merely made more urgent the necessity of solving an existing one.

Try not to become a man of success, but a man of value. Look around at how people want to get more out of life than they put in. A man of value will give more than he receives. Be creative, but make sure that what you create is not a curse for mankind.

Without the sense of fellowship with men of like mind... life would have seemed to me empty.