Since you confess yourself a son of the church, you should treat with more honor the head of the church, that is, St. Peter, the prince of the apostles. If you are one of the sheep of the Lord, you have been intrusted to him by divine authority, for Christ said to him: "Peter, feed my sheep" [John 21:16]; and again: "And I will give unto thee the keys of the kingdom of Heaven; and whatsoever thou shalt bind on earth shall be bound in heaven; and whatsoever thou shalt loose on earth shall be loosed in heaven" [Matt. 16:19]. And since we, although an unworthy sinner, exercise his authority by divine will, the words which you address to us are in reality addressed directly to him. And although we only read or hear the words, he sees the heart from which the words proceed. Therefore your highness should be very careful that no insincerity be found in your words and messages to us; and that you show due reverence, not to us indeed, but to omnipotent God, in those things which especially make for the advance of the Christian faith and the well-being of the church. For our Lord said to the apostles and to their successors: "He that heareth you heareth me; and he that despiseth you despiseth me" [Luke 10:16]. For no one will disregard our admonitions if he believes that the decrees of the pope have the same authority as the words of the apostle himself. For if our Lord commanded the apostles out of reverence for the seat of Moses to observe the sayings of the scribes and Pharisees who occupied that seat, then surely the faithful ought to receive with all reverence the apostolic and evangelical doctrine through those who are chosen to the ministry of preaching.