The human body contains blood, phlegm, yellow bile and black bile. These are the things that make up its constitution and cause its pain and health. Health is primarily that state in which these constituent substances are in the correct proportion to each other, both in strength and quantity, and are well mixed.

The chief virtue that language can have is clearness, and nothing detracts from it so much as the use of unfamiliar words.

Make a habit of two things: to help; or at least to do no harm.

I will follow that system of regimen which, according to my ability and judgment, I consider for the benefit of my patients, and abstain from whatever is deleterious and mischievous.

There are, in effect, two things, to know and to believe one knows; to know is science; to believe one knows is ignorance.

Things that are holy are revealed only to men who are holy.

Silence is not only never thirsty, but also never brings pain or sorrow.