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

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

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

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

The brain is an unreliable organ, it is monstrously great, monstrously developed. Swollen, like a goiter.

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

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

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

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

What is outside my mind means nothing to it.

Your mind’s got to eat, too.

There is no female mind. The brain is not an organ of sex. As well speak of a female liver.

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