Gregory of Nazianzus : Great indeed was Moses, who afflicted Egypt grievously and saved his people by many signs and prodigies, who went within the cloud and instituted the twofold law: the law of the letter without and the law of the spirit within. Aaron also, the brother of Moses according to the flesh and the spirit, sacrificed and prayed on behalf of the people, as consecrated minister of the great and holy tabernacle, "which the Lord has erected and not man." — ORATION 43, On St. Basil 72