Understanding is a very dull occupation.

As is the face, so is the mind.

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

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

The mind of man is capable of anything.

From a man’s face, I can read his character. If I can see him walk, I know his thoughts.

In psychoanalysis nothing is true except the exaggerations.

Is there no way out of the mind?

Strength of mind is exercise, not rest.

The sleep of reason produces monsters.

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

A mind lively and at ease can do with seeing nothing, and can see nothing that does not answer.

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.