As long as there will be a man, there will be wars.

The truth of a theory is in your mind, not in your eyes.

While I am a convinced pacifist there are circumstances in which I believe the use of force is appropriate - namely, in the face of an enemy unconditionally bent on destroying me and my people.

The aim (of education) must be the training of independently acting and thinking individuals who, however, see in the service to the community their highest life problem.

We scientists, whose tragic destination has been to help in making the methods of annihilation more gruesome and more effective, must consider it our solemn and transcendent duty to do all in our power in preventing these weapons from being used for the brutal purpose for which they were invented.

All these primary impulses, not easily described in words, are the springs of man's actions.

I am convinced there is only one way to eliminate these grave evils, namely through the establishment of a socialist economy, accompanied by an educational system which would be oriented toward social goals.