This sermon was delivered at St. Ieronymos of Aegina Orthodox Church in Hillsdale, Michigan on 11/24 November, 2022. There are two errors in the sermon: 1. Marmoutier is no longer a monastery; it was disestablished and had most of its buildings destroyed by the revolutionaries in 1799, and it was never restored as a monastery (Liguge, on the other hand, was restored by the Solesmes Congregation in the 19th century). 2. The Priscilianists were to be found almost entirely in Spain; there were very few in southern Gaul.