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

my mind is
a big hunk of irrevocable nothing

Brain, n. An apparatus with which we think that we think.

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

Don’t lose your mind unless you have paid for it.

The most potent weapon in the hands of the oppressor is the mind of the oppressed.

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.

The real question is not whether machines think but whether men do.

It is far, far better and much safer to have a firm anchor in nonsense than to put out on the troubled seas of thought.

Strength of mind is exercise, not rest.

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

The human mind is an evolutionary product, just like the human body.