Full Idea
In medicine, at least, most people are not self-sufficient at prescribing and effecting cures for themselves, and here some people are superior to others.
Gist of Idea
Clearly some people are superior to others when it comes to medicine
Source
Plato (Theaetetus [c.364 BCE], 171e)
Book Reference
Plato: 'Theaetetus', ed/tr. Waterfield,Robin [Penguin 1987], p.65