Man lives by imagination.

Still, whether we like it or not, the task of speeding up the decrease of the human population becomes increasingly urgent.

The modesty of women, which, in its most primitive form among animals, is based on sexual periodicity, is, with that periodicity, an essential condition of courtship.

The romantic embrace can only be compared with music and with prayer.

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.

It is on our failures that we base a new and different and better success.

Reproduction is so primitive and fundamental a function of vital organisms that the mechanism by which it is assured is highly complex and not yet clearly understood. It is not necessarily connected with sex, nor is sex necessarily connected with reproduction.