I swear by Apollo the physician, and Aesculapius, and Health,
and All-heal, and all the gods and goddesses, that, according
to my ability and judgment, I will keep this Oath and this
stipulation -- to reckon him who taught me this Art equally dear
to me as my parents, to share my substance with him, and relieve
his necessities if required; to look upon his offspring in the
same footing as my own brothers, and to teach them this art, if
they shall wish to learn it, without fee or stipulation; and
that by precept, lecture, and every other mode of instruction,
I will impart a knowledge of the Art to my own sons, and those
of my teachers, and to disciples bound by a stipulation and oath
according to the law of medicine, but to none others. 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. [...]
[ Hippocrates' Oath, translated by Francis Adams ]

PHYSICIAN, n. One upon whom we set our hopes when ill and our
dogs when well.
[ The Devil's Dictionary, by Ambrose Bierce ]