Technical Utopias-flying, for example-have been achieved by the new science of nature.The human utopia...a united new humankind living in solidarity and peace, free from economic determination and from war and class struggle-can be achieved, provided we spend the same energy, intelligence, and enthusiasm on the realization of the human Utopia as we have spent on the realization of our technical Utopias.

Infantile love follows the principle: "I love because I am loved." Mature love follows the principle: "I am loved because I love." Immature love says: "I love you because I need you." Mature love says: "I need you because I love you.

The whole life of the individual is nothing but the process of giving birth to himself; indeed, we should be fully born when we die.

I am a socialist. However, I have to add that what I understand by socialism is exactly the opposite of what many people, or most people, today mean by socialism.

Freedom does not mean license.

Man does not only sell commodities, he sells himself and feels himself to be a commodity.

Giving is more joyous than receiving, not because it is a deprivation, but because in the act of giving lies the expression of my aliveness.