I consider it a good rule for letter-writing to leave unmentioned what the recipient already knows, and instead tell him something new.

Whoever loves becomes humble. Those who love have, so to speak, pawned a part of their narcissism.

The expectation that every neurotic phenomenon can be cured may, I suspect, be derived from the layman's belief that the neuroses are something quite unnecessary which have no right whatever to exist. Whereas in fact they are severe, constitutionally fixed illnesses, which rarely restrict themselves to only a few attacks but persist as a rule over long periods throughout life.

Smoking is indispensable if one has nothing to kiss.

Philosophers stretch the meaning of words until they retain scarcely anything of their original sense. They give the name of "God" to some vague abstraction which they have created for themselves; having done so they can pose before all the world as deists, as believers of God, and they can even boast that they have recognized a higher, purer concept of God, notwithstanding that their God is not nothing more than an insubstantial shadow and no longer the mighty personality of religious doctrines.

The intention that man should be happy is not in the plan of Creation.

We must love or we grow ill.