It is impossible to overlook the extent to which civilization is built upon a renunciation of instinct.

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.

We must love or we grow ill.

Neither in my private life nor in my writings, have I ever made a secret of being an out-and-out unbeliever.

Obsessional prohibitions are extremely liable to displacement. They extend from one object to another along whatever paths the context may provide, and this new object then becomes, to use the apt expression of one of my women patients, 'impossible' - till at last the whole world lies under an embargo of 'impossibility'.

The voice of the intellect is soft one, but it does not rest until it has gained a hearing. Ultimately, after endless rebuffs, it succeeds. This is one of the few points in which one may be optimistic about the future of mankind.

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.