It is not for us . . . to send out missionaries to foreign peoples; it is our task to build up our own Western culture.

In each of us there is another whom we do not know.

A man who has not passed through the inferno of his passions has never overcome them. They then dwell in the house next door, and at any moment a flame may dart out and set fire to his own house. Whenever we give up, leave behind, and forget too much, there is always the danger that the things we have neglected will return with added force.

Anyone who wants to know the human psyche will learn next to nothing from experimental psychology. He would be better advised to abandon exact science, put away his scholar's gown, bid farewell to his study, and wander with human heart through the world.

Only the wounded physician heals.

Conflicts create the fire of affects and emotions; and like every fire it has two aspects: that of burning and that of giving light.

As one grows older one must try not to work oneself to death unnecessarily. At least that's how it is with me... I can scarcely keep pace and must watch out that the creative forces do not chase me around the universe in a wallop.