Cicero, On the Nature of the Gods 1.107 = Orph. 889 Bernabé
Orpheum poetam docet Aristoteles Arist. fr. 7 Rose numquam fuisse, et hoc Orphicum carmen Pythagorei ferunt cuiusdam fuisse Cercopis; at Orpheus, id est imago eius, ut vos vultis, in animum meum saepe incurrit.
Aristotle teaches that the poet Orpheus never existed, and the Pythagoreans say that this Orphic poem was the work of a certain Cercops. But Orpheus, or rather his image, as you would say, often comes to my mind.