Augustine, City of God, book 6, chapter 7:
There are sacred rites of the mother of the gods, in which the beautiful youth Atys, loved by her, and castrated by her through a woman’s jealousy, is deplored by men who have suffered the like calamity, whom they call Galli. …
What good is to be thought of their sacred rites which are concealed in darkness, when those which are brought forth into the light are so detestable? And certainly they themselves have seen what they transact in secret through the agency of mutilated and effeminate men. Yet they have not been able to conceal those same men miserably and vile enervated and corrupted.
Let them persuade whom they can that they transact anything holy through such men, who, they cannot deny, are numbered, and live among their sacred things. We know not what they transact, but we know through whom they transact; for we know what things are transacted on the stage, where never, even in a chorus of harlots, hath one who is mutilated or an effeminate appeared.
And, nevertheless, even these things are acted by vile and infamous characters; for, indeed, they ought not to be acted by men of good character. What, then, are those sacred rites, for the performance of which holiness has chosen such men as not even the obscenity of the stage has admitted?