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

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

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

Strength of mind is exercise, not rest.

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.

Is there no way out of the mind?

Your mind’s got to eat, too.

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

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

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

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.

Brains are the only things worth having in this world.