What I value in life is quality rather then quantity.

I never think of the future - it comes soon enough.

Whether or not you can observe a thing depends upon the theory you use. It is the theory which decides what can be observed.

Only one who devotes himself to a cause with his whole strength and soul can be a true master. For this reason mastery demands all of a person.

Most people see what is, and never see what can be.

I do not believe that civilization will be wiped out in a war fought with the atomic bomb. Perhaps two-thirds of the people of the earth will be killed.

Politics is more difficult than physics.