Everyone, including the Athenians [...] are right to accept advice from anyone, since it is incumbent on everyone to share in that sort of excellence, or else there can be no city at all.
ProtagorasMany things prevent knowledge, including the obscurity of the subject and the brevity of human life
ProtagorasMan is the measure of all things, of things that are that they are, and of things that are not that they are not.
Protagoras