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

Tobacco is the only excuse for Columbus's misadventure in discovering America.

The ego represents what we call reason and sanity, in contrast to the id which contains the passions.

In almost every place where we find totems we also find a law against persons of the same totem having sexual relations with one another and consequently against their marrying. This, then, is 'exogamy', an institution related to totemism.

Dreams are often most profound when they seem the most crazy.

No neurotic harbors thoughts of suicide which are not murderous impulses against others redirected upon himself.

Psycho-analysis has taught us that a boy's earliest choice of objects for his love is incestuous and that those objects are forbidden ones - his mother and his sister. We have learnt, too, the manner in which, as he grows up, he liberates himself from this incestuous attraction. A neurotic, on the other hand, invariably exhibits some degree of psychical infantilism. He has either failed to get free from the psychosexual conditions that prevailed in his childhood or he has returned to them - two possibilities which may be summed up as developmental inhibition and regression.