The behavior of a human being in sexual matters is often a prototype for the whole of his other modes of reaction in life.

The sexual wishes in regard to the mother become more intense and the father is perceived as an obstacle to the; this gives rise to the Oedipus complex.

Thinking is an experimental dealing with small quantities of energy, just as a general moves miniature figures over a map before setting his troops in action.

Men are not gentle, friendly creatures wishing for love, who simply defend themselves if they are attacked, but ... a powerful measure of desire for aggression had to be reckoned as part of their instinctual endowment.

Much of our highly valued cultural heritage has been acquired at the cost of sexuality.

As regards intellectual work it remains a fact, indeed, that great decisions in the realm of thought and momentous discoveries and solutions of problems are only possible to an individual, working in solitude.

The behavior of a human being in sexual matters is often a prototype for the whole of his other modes of reaction in life.