In human beings pure masculinity or femininity is not to be found either in a psychological or biological sense.

The ego represents what we call reason and sanity, in contrast to the id which contains the passions.

Do you not know how uncontrolled and unreliable the average human being is in all that concerns sexual life?

America is the most grandiose experiment the world has seen, but, I am afraid, it is not going to be a success.

One feels inclined to say that the intention that man should be 'happy' is not included in the plan of Creation.' . . . We are so made that we can derive intense enjoyment only from a contrast and very little from a state of things.

Religion is an illusion and it derives its strength from the fact that it falls in with our instinctual desires.

The idea of life having a purpose stands and falls with the religious system.