Man may be defined as the animal that can say ''I,'' that can be aware of himself as a separate entity.

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.

Love is the productive form of relatedness to others and to oneself. It implies responsibility, care, respect. If it isn't productive and respectful, it isn't love, but only fear masquerading as love.

The average American never loses his sleep about affairs which relate to his society and to our whole country.

The lust for power is not rooted in strength but in weakness.

Selfish persons are incapable of loving others, but they are not capable of loving themselves either.

The danger of the past was that men became slaves. The danger of the future is that man may become robots.