Hippocrates
(460-370 BC) 
Greek physician and the "Father of Medicine."

 
Life is short, art long, opportunity fleeting, 
experience treacherous, judgment difficult.

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We must turn to nature itself, 
to the observations of the body in health and disease 
to learn the truth.

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

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Sleep and watchfulness, both of them, 
when immoderate, constitute disease.

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Everything in excess is opposed to nature.

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As to diseases, make a habit of two things -- 
to help, or at least to do no harm.

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Healing is a matter of time, 
but it is sometimes also a matter of opportunity.

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To do nothing is also a good remedy.