There is no meaning to life except the meaning man gives to his life by the unfolding of his powers.

Immature love says, “I love you because I need you.” Mature love says, “I need you because I love you.”

Sleep is often the only occasion in which man cannot silence his conscience; we forget what we knew in our dream.

The most beautiful as well as the most ugly inclinations of man are not part of a fixed biologically given human nature, but result from the social process which creates man.

The successful revolutionary is a statesman, the unsuccessful one a criminal.