To know the brain...is equivalent to ascertaining the material course of thought and will, to discovering the intimate history of life in its perpetual duel with external forces.

The brain is a world consisting of a number of unexplored continents and great stretches of unknown territory.

Every man if he so desires becomes sculptor of his own brain.

The worst part is not in making a mistake but in trying to justify it, instead of using it as a heaven-sent warning of our mindlessness or our ignorance.

In summary, all great work is the fruit of patience and perseverance, combined with tenacious concentration on a subject over a period of months or years.

Unfortunately, nature seems unaware of our intellectual need for convenience and unity, and very often takes delight in complication and diversity.

There are no small problems. Problems that appear small are large problems that are not understood

It is idle to dispute with old men. Their opinions, like their cranial sutures, are ossified.

In adult centers the nerve paths are something fixed, ended, immutable. Everything may die, nothing may be regenerated.

That which enters the mind through reason can be corrected. That which is admitted through faith, hardly ever.

Nothing inspires more reverence and awe in me than an old man who knows how to change his mind.

Immodest creature, you do not want a woman who will accept your faults, you want the one who pretends you are faultless – one who will caress the hand that strikes her and kiss the lips that lie to

If you lock the door on sorrow, how will it leave your heart?

The only thing more dangerous then your enemy knowing how powerful you are, is your enemy not knowing how powerful you are.

Though firm, we are never too firm, though we love fun, we never have fun in a silly way that makes us appear ridiculous, unless that is our intent.

Babies are born with neither good nor bad character. Normal people - as they grow, learn and are trained - develop better or worse dispositions and habits of conduct.

I think fashion is just part of my life and if it hadn't been fashion then it would have been something else.

Who is in your life asking you the tough questions?

Hate multiplies hate, violence multiplies violence, and toughness multiplies toughness in a descending spiral of destruction.

Besides, you're a cat. It's your nature to think you're the center of the universe.

A language does not become fixed. The human intellect is always on the march, or, if you prefer, in movement, and languages with it.