Our separation from each other is an optical illusion.

There is only one road to human greatness: through the school of hard knocks.

One should guard against preaching to young people success in the customary form as the main aim in life. The most important motive for work in school and in life is pleasure in work, pleasure in its result, and the knowledge of the value of the result to the community.

The armament industry is indeed one of the greatest dangers that beset mankind. It is the hidden evil power.

One should respect an honest person even if he expresses opinions differing from one's own.

What is the meaning of human life, or of organic life altogether? To answer this question at all implies a religion.

Everyone must become their own person, however frightful that may be.