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

Not all heads have a brain.

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

What is outside my mind means nothing to it.

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

Understanding is a very dull occupation.

Strength of mind is exercise, not rest.

The march of the human mind is slow.

Brains are the only things worth having in this world.

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

Your mind’s got to eat, too.

Every thought is, strictly speaking, an afterthought.

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