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

Brains are the only things worth having in this world.

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

The sleep of reason produces monsters.

Strength of mind is exercise, not rest.

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

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

It is far, far better and much safer to have a firm anchor in nonsense than to put out on the troubled seas of thought.

In psychoanalysis nothing is true except the exaggerations.

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

Every thought is, strictly speaking, an afterthought.

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

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