I swear... to hold my teacher in this art equal to my own parents; to make him partner in my livelihood; when he is in need of money to share mine with him; to consider his family as my own brothers and to teach them this art, if they want to learn it, without fee or indenture.
Hippocrates (1923). “Ancient Medicine, Airs, Waters, Places, Epidemics 1 and 3, the Oath, Precepts, Nutriment”, Loeb Classical Library