We must reckon with the possibility that something in the nature of the sexual instinct itself is unfavorable to the realization of complete satisfaction.

The dream is the liberation of the spirit from the pressure of external nature, a detachment of the soul from the fetters of matter.

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

A strong egoism is a protection against disease, but in the last resort we must begin to love in order that we may not fall ill, and must fall ill if, in consequence of frustration, we cannot love.

Crystals reveal their hidden structures only when broken.

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

The first requisite of civilization, therefore, is that of justice — that is, the assurance that a law once made will not be broken in favour of an individual. This implies nothing as to the ethical value of such a law.