A physician without a knowledge of Astrology has no right to call himself a physician.

Fat people who want to reduce should take their exercise on an empty stomach and sit down to their food out of breath.... Thin people who want to get fat should do exactly the opposite and never take exercise on an empty stomach.

Prayer indeed is good, but while calling on the gods a man should himself lend a hand.

Men ought to know that from the brain, and from the brain only, arise our pleasures, joy, laughter and jests, as well as our sorrows, pains, griefs, and tears.

There are in fact two things, science and opinion. The former begets knowledge, the latter ignorance.

That which is used - develops. That which is not used wastes away.

Men think epilepsy divine, merely because they do not understand it. We will one day understand what causes it, and then cease to call it divine. And so it is with everything in the universe.