The functional importance of the ego is manifested in the fact that normally control over the approaches to motility devolves upon it. Thus in its relation to the id it is like a man on horse back, who has to hold in check the superior strength of the horse; with this difference, that the rider tries to do so with his own strength while the ego uses borrowed forces.

I should like to raise the question whether the inevitable stunting of the sense of smell as a result of man's turning away from the earth, and the organic repression of the smell-pleasure produced by it, does not largely share in his predisposition to nervous diseases.

Man has, as it were, become a kind of prosthetic God.

The tendency to aggression is an innate, independent, instinctual disposition in man... it constitutes the powerful obstacle to culture.

In every age immorality has found no less support in religion than morality has. If the achievements of religion in respect to man's happiness, susceptibility to culture and moral control are no better than this, the question cannot but arise whether we are not overrating its necessity for mankind, and whether we do wisely in basing our cultural demands upon it.

A man should not strive to eliminate his complexes but to get into accord with them: they are legitimately what directs his conduct in the world.

Man has, as it were, become a kind of prosthetic God. When he puts on all his auxiliary organs, he is truly magnificent; but those organs have not grown on him and they still give him much trouble at times.

Demons do not exist any more than gods do, being only the products of the psychic activity of man.

No matter how much restriction civilization imposes on the individual, he nevertheless finds some way to circumvent it. Wit is the best safety valve modern man has evolved; the more civilization, the more repression, the more need there is for wit.".