Dogs love their friends and bite their enemies, quite unlike people, who are incapable of pure love and always have to mix love and hate.

The psychic development of the individual is a short repetition of the course of development of the race.

If youth knew; if age could.

It is a great injustice to persecute homosexuality as a crime, and cruelty too

When it happens that a person has to give up a sexual object, there quite often ensues an alteration of his ego which can only be described as a setting up of the object inside the ego, as it occurs in melancholia; the exact nature of this substitution is as yet unknown to us.

I take up the standpoint that the tendency to aggression is an innate, independent, instinctual disposition in man, and I come back now to the statement that it constitutes the most powerful obstacle to culture.

Thinking in pictures is, therefore, only a very incomplete form of becoming conscious. In some way, too, it stands nearer to unconscious processes than does thinking in words, and it is unquestionably older than the latter both ontogenetically and phylogenetically.