They say that Orpheus, a Thracian by birth, and the one who taught about the Greek mysteries, taught how one must worship the gods, too. And he called this worship of the gods thrēskeuein, because its origin was Thracian. However, others provided a different etymology, namely, that thrēskeuein is derived from a *theoderkeuein, as it were, that is, "to see the god" (theon horân). For derkein means "to see"