To be too conscious is an illness—a real thoroughgoing illness.

Is there no way out of the mind?

Strength of mind is exercise, not rest.

“I think, therefore I am” is the statement of an intellectual who underrates toothaches.

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.

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

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

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

The march of the human mind is slow.

We need strength, we need energy, we need quickness, and we need brain in this country to turn it around.

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

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