Certainly there are things worth believing. I believe in the brotherhood of man and the uniqueness of the individual. But if you ask me to prove what I believe, I can't. You know them to be true but you could spend a whole lifetime without being able to prove them. The mind can proceed only so far upon what it knows and can prove. There comes a point where the mind takes a leap—call it intuition or what you will—and comes out upon a higher plane of knowledge, but can never prove how it got there. All great discoveries have involved such a leap.

If the bees disappear, man would have only four years of life left.

We can understand almost anything, but we can't understand how we understand.

The stupid are invincible.

You cannot simultaneously prevent and prepare for war.

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

Body and soul are not two different things, but only two different ways of perceiving the same thing. Similarly, physics and psychology are only different attempts to link our experiences together by way of systematic thought.