There are, in effect, two things, to know and to believe one knows; to know is science; to believe one knows is ignorance.
HippocratesI 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