The sun, the moon and the stars would have disappeared long ago, had they happened to be within reach of predatory human hands.

If men and women are to understand each other, to enter into each other's nature with mutual sympathy, and to become capable of genuine comradeship, the foundation must be laid in youth.

All the art of living lies in a fine mingling of letting go and holding on.

It is becoming clear that the old platitudes can no longer be maintained, and that if we wish to improve our morals we must first improve our knowledge.

Pain and death are part of life. To reject them is to reject life itself.

Of woman as a real human being, with sexual needs and sexual responsibilities, morality has often known nothing.