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
ProtagorasThere are intelligible principles inherent in the matter of every phenomenon; because matter is essentially the sum of all the seemings that it has for any and all persons.
Protagoras