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

What a torture to talk to filled heads that allow nothing from the outside to enter them.

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

Any man could, if he were so inclined, be the sculptor of his own brain.

Not all heads have a brain.

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.

my mind is
a big hunk of irrevocable nothing

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

Is there no way out of the mind?

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

What is outside my mind means nothing to it.

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