Σύρροια μία, σύμπνοια μία, συμπαθέα πάντα. (One flux, one breath, sympathy all) - Hippocrates

ἀσκεῖν περὶ τὰ νοσήματα δύο, ὠφελεῖν ἢ μὴ βλάπτειν

Certain s and physicians say that it is not possible for any one to know medicine who does not know what man is, and that who ever would cure men properly, must learn this in the first place. But this saying rather appertains to philosophy, as Empedocles and certain others have described what man in his origin is, and how he first was made and constructed. But I think whatever such has been said or written by sophist or physician concerning nature has less connexion with the art of medicine than with the art of painting. And I think that one cannot know anything certain respecting nature from any other quarter than from medicine... Wherefore it appears to me necessary to every physician to be skilled in nature, and strive to know... what man is in relation to the articles of food and drink, and to his other occupations, and what are the effects of each of them to every one.

Life is short, and Art long; the crisis fleeting; experience perilous, and decision difficult.