33 These are great faults, but still small in comparison with the rest. Their Baptism I dare not describe before men and women. I dare not say what they distribute to their wretched communicants....Truly we pollute our mouth in speaking of these things. Are the heathen more detestable than these? Are the Samaritans more wretched? Are Jews more impious? Are fornicators more impure? But the Manichee sets these offerings in the midst of the altar as he considers it. And do you, O man, receive instruction from such a mouth? On meeting this man do you greet him at all with a kiss? To say nothing of his other impiety, do you not flee from the defilement, and from men worse than profligates, more detestable than any prostitute?
Source: Catechetical Lectures (New Advent)