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Aristotle was famous for knowing everything. He taught that the brain exists merely to cool the blood and is not involved in the process of thinking. This is true only of certain persons.

The philosophy of the wisest man that ever existed, is mainly derived from the act of introspection.

I've deliberately studied many things that I know, going in, I won't be able to assimilate. I read Plato, St. Thomas, the mystics, to exercise my mind.

In ancient Greece, Socrates reportedly didn't fancy a literate society. He felt that people would lose the capacity to think for themselves, simply adopting the perspective of a handy written opinion, and that they would cease to remember what could be written down.

Good thinkers always prime the pump of ideas. They always look for things to get the thinking process started, because what you put in always impacts what comes out.

My opinions about human nature are shared by many psychologists, linguists, and biologists, not to mention philosophers and scholars going back centuries.

In Socrates' thought the two marks of individual self-consciousness appear; it is practical and it is social.

In Aristotle the mind, regarded as the principle of life, divides into nutrition, sensation, and faculty of thought, corresponding to the inner most important stages in the succession of vital phenomena.

A few of the sublimest geniuses of Rome and Athens had some faint discoveries of the spiritual nature of the human soul, and formed some probable conjectures, that man was designed for a future state of existence.

My hero Socrates trained Plato on a rock. How much did that cost? So the greatest minds in history became the greatest minds in history without spending a lot of money.