The mind is not, I know, a highway but a temple, and its doors should not be carelessly left open.

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.

The march of the human mind is slow.

From a man’s face, I can read his character. If I can see him walk, I know his thoughts.

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.

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

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

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

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

The mind of man is capable of anything.

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

Sanity is madness put to good uses; waking life is a dream controlled.

What the brain does by itself is infinitely more fascinating and complex than any response it can make to chemical stimulation.