The goal of all life is death

Civilized society is perpetually menaced with disintegration through this primary hostility of men towards one another.

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

The ego is not master in its own house.

Taboo restrictions are distinct from religious or moral prohibitions. They are not based upon any divine ordinance, but may be said to impose themselves on their own account. They differ from moral prohibitions in that they fall into no system that declares quite generally that certain abstinences must be observed and gives reasons for that necessity.

The more the fruits of knowledge become accessible to men, the more widespread is the decline of religious belief.

Humanity is in the highest degree irrational, so that there is no prospect of influencing it by reasonable arguments. Against prejudice one can do nothing.