Man is the only animal for whom his own existence is a problem which he has to solve.

In love the paradox occurs that two beings become one and yet remain two.

I believe that one can and must hope for a sane society that furthers man's capacity to love his fellow men, to work and create, to develop his reason and his objectivity of a sense of himself that is based on the experience of his productive energy. I believe that one can and must hope for the collective regaining of a mental health that is characterized by the capacity to love and to create.

Fairness means not to use fraud and trickery in the exchange of commodities and services and the exchange of feelings.

All great art is by its very essence in conflict with the society with which it exists. It expresses the truth about the existence regardless of whether this truth serves or hinders the survival purpose of a given society. All great art is revolutionary because it touches upon the reality of man and questions the reality of the various transitory forms of human society.

For [Karl] Marx it is socialist society which realizes "concretely" the religious principles of equality, brotherly love, and freedom.

Man is the only animal who does not feel at home in nature, who can feel evicted from paradise, the only animal for whom his own existence is a problem that he has to solve and from which he cannot escape. He cannot go back to the prehuman state of harmony with nature, and he does not know where he will arrive if he goes forward. Man's existential contradiction results in a state of constant disequilibrium. This disequilibrium distinguishes him from the animal, which lives, as it were, in harmony with nature.