Plutarch's Lives, Volume IV

I. Many writers have very naturally conceived that the myth of Ixion, who is fabled to have embraced a cloud instead of Hera, and so to have begotten the centaurs, is really typical of ambitious men; for, although they aim at obtaining glory, and set before themselves a lofty ideal of virtue, yet they never succeed in producing any very distinct result, because all their actions are coloured by various human passions and prejudices, just as the herdsmen with their flocks say in Sophokles’s ...