“'SO THEN, brethren, stand fast, and hold to the traditions which you were taught, whether by word, or by Epistle of ours’ (2 Th. 2:15). Hence it is manifest, that they did not deliver all things by Epistle, but many things also unwritten, and in like manner both the one and the other are worthy of credit. Therefore let us think the tradition of the Church also worthy of credit. It is a tradition, seek no farther.”
~St. John Chrysostom (c. 347 - 407): Homilies on Second Thessalonians, MG 62, 488.
Russian icon of St. John Chrysostom