My success wasn't so much due to intelligence, but the fact that I stuck with problems longer.

The world is not threatened by evil people, but by those who allow evil to take place.

The daily struggle does not arise from a purpose or a program, but from an immediate need.

... the desire for truth must take precedence over all other desires.

Everybody is a genius. But if you judge a fish by its ability to climb a tree, it will live its whole life believing that it is stupid.

Imagination is the highest form of research.

I am an absolute pacifist...It is an instinctive feeling. It is a feeling that possesses me, because the murder of men is disgusting.