What is outside my mind means nothing to it.

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

Strength of mind is exercise, not rest.

“I think, therefore I am” is the statement of an intellectual who underrates toothaches.

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

If anything affects your eye, you hasten to have it removed; if anything affects your mind, you postpone the cure for a year.

Your mind’s got to eat, too.

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

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

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

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.

Understanding is a very dull occupation.