St. Gregory Palamas in his homily to the people of Thessaloniki on the day of  Pentecost ends with a warning.  It seems the “Barbarian” Serbian army was threatening the city of Thessaloniki at the time, and according to St. Gregory, deliverance from God would come only if the people repented.  The people were to repent particularly from four sins that St. Gregory names: fornication, adultery, effeminate homosexuality and aggressive homosexuality (the last…