It is a mistake to believe that science consists in nothing but conclusively proved propositions, and it is unjust to demand that it should. It is a demand made by those who feel a craving for authority in some form to replace the religious catechism by something else, even a scientific one.

The primitive stages can always be re-established; the primitive mind is, in the fullest meaning of the word, imperishable.

The three major mother gods of the Eastern populations seemed to be generating and destroying entities at the same time; both goddesses of life and fertility as well as goddesses of death.

In this way the ego detaches itself from the external world. It is more correct to say: Originally the ego includes everything, later it detaches from itself the external world. The ego-feeling we are aware of now is thus only a shrunken vestige of a far more extensive feeling - a feeling which embraced the universe and expressed an inseparable connection of the ego with the external world.

The idea of men's receiving an intimation of their connection with the world around them through an immediate feeling which is from the outset directed to that purpose sounds so strange and fits in so badly with the fabric of our psychology that one is justified in attempting to discover a psycho-analytic - that is, a genetic - explanation of such a feeling.

There is no likelihood of our being able to suppress humanity's aggressive tendencies... Complete suppression of man's aggressive tendencies is not an issue; what we may try is to direct it into a channel other than that of warfare.

A love that does not discriminate seems to me to forfeit a part of its own value, by doing an injustice to its object; and secondly, not all men are worthy of love.