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

Any man could, if he were so inclined, be the sculptor of his own brain.

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.

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.

What is outside my mind means nothing to it.

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

Madness need not be all breakdown. It may also be breakthrough.

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

In psychoanalysis nothing is true except the exaggerations.

The march of the human mind is slow.

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

Strength of mind is exercise, not rest.