Strength of mind is exercise, not rest.

—Alexander Pope, 1733

Understanding is a very dull occupation.

—Gertrude Stein, 1937

Every thought is, strictly speaking, an afterthought.

—Hannah Arendt, 1978

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

—Ambrose Bierce, 1906

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

—Fyodor Dostoevsky, 1864

As is the face, so is the mind.

—Roman proverb

Is there no way out of the mind?

—Sylvia Plath, 1962

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

—Donald Trump, 2015

The brain may be regarded as a kind of parasite of the organism, a pensioner, as it were, who dwells with the body.

—Arthur Schopenhauer, 1851

The sleep of reason produces monsters.

—Francisco Goya, 1799

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

—Steve Biko, 1971

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.

—Edith Hamilton, 1930

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

—William Shakespeare, 1603