On Differences of Custom and Usage

St. Theophylact of Ochrid ca. 1055-1107
When we Greeks find fault with the Filioque, they shake Peter’s keys at us… Nevertheless differences of custom and usage are no sufficient grounds for schism. Experience shows that arguing about azyma and Lenten fasts gets nowhere. The Greeks should be accommodating and make concessions… hoping that in time they will correct their errors to conform to the apostolic tradition stemming from Jerusalem. (Henry Chadwick, “East and West The Making of a Rift in the Church From Apostolic Times Until the Council of Florence. Chap. 34, pp. 221-222)