As to diseases, make a habit of two things — to help, or at least, to do no harm. — Epidemics, Book I, Ch. 2, Full text online at Wikisource — Variant translation: The physician must be able to tell the antecedents, know the present, and foretell the future — must mediate these things, and have two special objects in view with regard to disease, namely, to do good or to do no harm. — Paraphrased variants: — Wherever a doctor cannot do good, he must be kept from doing harm. — Viking Book of Aphorhttps://en.wikiquote.org/wiki/Hippocrates