All things therefore are of one and the same substance, that is, from one and the same God; as also the Lord says to the disciples "Therefore every scribe, which is instructed unto the kingdom of heaven, is like unto a man that is an householder, which bringeth forth out of his treasure things new and old." He did not teach that he who brought forth the old was one, and he that brought forth the new, another; but that they were one and the same. For the Lord is the good man of the house, who rules the entire house of His Father; and who delivers a law suited both for slaves and those who are as yet undisciplined; and gives fitting precepts to those that are free, and have been justified by faith, as well as throws His own inheritance open to those that are sons. And He called His disciples "scribes" and "teachers of the kingdom of heaven;" of whom also He elsewhere says to the Jews: "Behold, I send unto you wise men, and scribes, and teachers; and some of them ye shall kill, and persecute from city to city." Now, without contradiction, He means by those things which are brought forth from the treasure new and old, the two covenants; the old, that giving of the law which took place formerly; and He points out as the new, that manner of life required by the Gospel, of which David says, "Sing unto the Lord a new song;" and Esaias, "Sing unto the Lord a new hymn. His beginning, His name is glorified from the height of the earth: they declare His powers in the isles." And Jeremiah says: "Behold, I will make a new covenant, not as I made with your fathers" in Mount Horeb. But one and the same householder produced both covenants, the Word of God, our Lord Jesus Christ, who spake with both Abraham and Moses, and who has restored us anew to liberty, and has multiplied that grace which is from Himself.

People are in error who think that the priests of the Lord, after a lapse, although they may have exhibited true repentance, are not capable of ministering to the Lord and engaging their honorable offices, even though they may lead a good life thereafter and perform their priesthood correctly. Individuals who hold this opinion are not only in error but also seem to argue and act in opposition to the power of the keys committed to the church, of which it is said, "Whatever you shall loose on earth shall be loosed in heaven." In short, this opinion either is not the Lord's or it is true. Be that as it may, we believe without hesitation that both the priests of the Lord and other believers may return to their place of honor after a proper satisfaction for their error, as the Lord testifies through his prophet: "Shall he who falls not also rise again? and shall he who turns away not return?" In another passage the Lord says, "I desire not the death of the sinner, but that he may turn and live." The prophet David, on his repentance, said, "Restore to me the joy of your salvation, and uphold me with your free Spirit." And he indeed, after his repentance, taught others also and offered sacrifice to God, giving thereby an example to the teachers of the holy church, that if they have fallen and thereafter have exhibited a right repentance to God, they may do both things in like manner. For he taught when he said, "I will teach transgressors your ways, and sinners will be converted to you." And he offered sacrifice for himself when he said, "The sacrifice for God is a broken spirit." For the prophet, seeing his own transgressions purged by repentance, had no doubt as to healing those of others by preaching and by making offering to God. Thus the shedding of tears moves the mind's feeling (passionem). And when the satisfaction is made good, the mind is turned aside from anger. For how does that person think that mercy will be shown to himself, who does not forgive his neighbor? If offences abound, then, let mercy also abound; for with the Lord there is mercy, and with him is plentiful redemption.

It must be enquired in this place whether, when they were first sent out, the disciples knew that He was the Christ. For this speech shews that Peter then first confessed Him to be the Son of the living God. And look whether you can solve a question of this sort, by saying that to believe Jesus to be the Christ is less than to know Him; and so suppose that when they were sent to preach they believed that Jesus was the Christ, and afterwards as they made progress they knew Him to be so. Or must we answer thus; That then the Apostles had the beginnings of a knowledge of Christ, and knew some little concerning Him; and that they made progress afterwards in the knowledge of Him, so that they were able to receive the knowledge of Christ revealed by the Father, as Peter, who is here blessed, not only for that he says, Thou art the Christ, but much more for that he adds, the Son of the living God.

Or they then spake of Him in lowly words, as only a great and wonderful man, but as yet proclaimed Him not as the Christ. Yet if any will have it that He was even at the first proclaimed to be Christ, he may say that now He chose that first short announcement of His name to be left in silence and not repeated, that that little which they had heard concerning Christ might be digested into their minds. Or the difficulty may be solved thus: that the former relation concerning their preaching Christ does not belong to the time before His Resurrection, but to the time that should be after the Resurrection; and that the command now given is meant for the time present; for it were of no use to preach Him, and to be silent concerning His cross. Moreover, He commanded them that they should tell no man that He was the Christ, and prepared them that they should afterwards say that He was Christ who was crucified, and who rose again from the dead.

And observe that it is not said,’ He began to say,’ or ‘to teach,’ but to shew; for as things are said to be shewn to the sense, so the things which Christ spake are said to be shewn by Him. Nor indeed do I think, that to those who saw Him suffering many things in the flesh, were those things which they saw so shewn as this representation in words shewed to the disciples the mystery of the passion and resurrection of Christ. At that time, indeed, He only began to shew them, and afterwards when they were more able to receive it, He shewed them more fully; for all that Jesus began to do, that He accomplished. He must needs go to Jerusalem, to be put to death indeed in the Jerusalem which is below, but to rise again and reign in the heavenly Jerusalem. But when Christ rose again, and others were risen with Him, they no longer sought the Jerusalem which is beneath, or the house of prayer in it, but that which is above. He suffers many things from the elders of the earthly Jerusalem, that He may be glorified by those heavenly elders who receive His mercies. He rose again from the dead on the third day, that He may deliver from the evil one, and purchase for such as are so delivered this gift, that they be baptized in spirit, soul, and body, in the name of the Father, and the Son, and the Holy Spirit, who are three days perpetually present to those that through them have been made children of light.

Yet the words in which Peter and those in which Satan are rebuked, are not, as is commonly thought, the same; to Peter it is said, Get thee behind me, Satan; that is, follow me, thou that art contrary to my will; to the Devil it is said, Go thy way, Satan, understanding not ‘behind me,’ but ‘into everlasting fire.’ He said therefore to Peter, Get thee behind me, as to one who through ignorance was ceasing to walk after Christ. And He called him Satan, as one, who through ignorance had somewhat contrary to God. But he is blessed to whom Christ turns, even though He turn in order to rebuke him. But why said He to Peter, Thou art an offence unto me, (Ps. 119:165.) when in the Psalm it is said, Great peace have they that love thy law, and there is no offence to them? It must be answered, that not only is Jesus not offended, but neither is any man who is perfect in the love of God; and yet he who does or speaks any thing of the nature of an offence, may be an offence even to one who is incapable of being offended. Or he may hold every disciple that sinneth as an offence, as Paul speaks, Who is offended, and I burn not?. (2 Cor. 11:29.)