The indifference, callousness and contempt that so many people exhibit toward animals is evil first because it results in great suffering in animals, and second because it results in an incalculably great impoverishment of the human spirit.

The world needs heroes and it's better they be harmless men like me than villains like Hitler

The important things are always simple.

It takes a different kind of thinking to solve a problem than the kind of thinking which produced the problem.

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.

I advocate world government because I am convinced that there is no other possible way of eliminating the most terrible danger in which man has ever found himself. The objective of avoiding total destruction must have priority over any other objective.

For an idea which, at first, does not seem absurd, there is no hope.