You can always make a lot of people love one another so long as there are a smaller number outside the group for them to kick.

The time comes when each of us has to give up as illusions the expectations which, in his youth, he pinned upon his fellow-men, and when he may learn how much difficulty and pain has been added to his life by their ill-will.

Maturity is the ability to postpone gratification.

There is no doubt that the resistance of the conscious and unconscious ego operates under the sway of the pleasure principle: it seeks to avoid the unpleasure which would be produced by the liberation of the repressed.

This is one race of people for whom psychoanalysis is of no use whatsoever.

A collection to which nothing can be added and from which nothing can be removed is, in fact, dead!

We believe that civilization has been created under the pressure of the exigencies of life at the cost of satisfaction of the instincts.