The highest possible stage in moral culture is when we recognize that we ought to control our thoughts.

Sanity is madness put to good uses; waking life is a dream controlled.

Sooner or later if the activity of the mind is restricted anywhere, it will cease to function even where it is allowed to be free.

The mind of man is capable of anything.

Imagination continually outruns the creature it inhabits.

Imagination is the secret and marrow of civilization. It is the very eye of faith.

The mind is not, I know, a highway but a temple, and its doors should not be carelessly left open.

In psychoanalysis nothing is true except the exaggerations.

The sleep of reason produces monsters.

Is there no way out of the mind?

What is the hardest task in the world? To think.

Though this be madness, yet there is method in’t.

The universe is an object of thought at least as much as it is a means of satisfying needs.