Ambrosiaster

Saul changed his name to Paul, and the change was permanent. Because Saul means restlessness or trial, when he came to faith in Christ he called himself Paul, i.e., rest, because our faith is peace. For whereas previously he had inflicted trials on the servants of God because of his desire to fulfill the law, later he himself endured trials on account of the hope which before he had denied because of his love of Judaism.In calling himself a “servant of Jesus Christ,” Paul shows that he has been delivered from the law, and he puts both names, Jesus and Christ, in order to signify the person of God and man, for in both he is Lord, as Peter the apostle testifies, saying: “He is the Lord of all.” And because he is Lord, he is also God, as David says: “For the Lord himself is God.” The heretics deny this. Marcion, it seems, denied Christ and his body out of hatred for the law, although he confessed Jesus. The Jews and Photinus denied that Jesus was God out of their zeal for the law. For whenever Scripture says either “Jesus” or “Christ,” it sometimes means the person of God and sometimes the person of the man, e.g.: “there is one Lord Jesus Christ, through whom are all things.”
“Called to be an apostle.” Because Paul acknowledged the Lord and confessed him he became the perfect servant and shows that he was promoted, saying that he was called to be an apostle, i.e., a messenger sent by the Lord to do his work. By this he shows that he had merit with God because he served Christ and not the law.
“Set apart for the gospel of God.” The gospel of God is good news, by which sinners are called to forgiveness. For since as a Pharisee the apostle held a teaching post among the Jews, he now says that he has been set apart from the preaching of Judaism for the gospel of God, so that abandoning the law, he might preach Christ who justifies those who believe in him, which the law could not do. This does not go against the law but affirms it, since the law itself says that this will happen in the future, in the words of Isaiah the prophet: “There will come from Zion one who will break and remove the captivity of Jacob, and this will be a testimony of me, when I shall take away their sins.”

“Concerning his Son.” It was fitting, since God promised his own Son to the world, that he should promise him through great men, so that from them it might be known how very powerful the one who was being preached was and so that he might include his future coming in the Holy Scriptures. And what is preached by the Holy Scriptures cannot be shown to be false.“Who was descended from the seed of David according to the flesh.” He who was the Son of God according to the Holy Spirit (that is, according to God, because God is Spirit and without any doubt he is holy), is said to have been made the Son of God according to the flesh by Mary, as it is written: “The Word became flesh.” Christ Jesus is both Son of God and Son of Man. As he is truly God, so also he is truly man. For he would not be truly man if he were not of flesh and soul. Otherwise he would be incomplete. For although he was the Son of God in eternity, he was not known by the creation until, when God wanted him to be revealed for the salvation of mankind, he made him visible and corporeal, because God wanted him to be known through his power to cleanse humans from their sins by overcoming death in the flesh. Therefore he was made of the seed of David. As he was born a king from God before the beginning of time, so also he would acquire birth from a king according to the flesh, being made from a virgin by the work of the Holy Spirit, i.e., born. Thus by the reverence reserved for him because of this fact, he who by his birth was distinguished from the law of nature would be recognized as being more than a man. This had been predicted by Isaiah the prophet: “Behold a virgin will conceive in her womb.” Hence when the newborn child appeared to be worthy of honor, a certain providence of God was discerned concerning a future visitation of the human race.

“To all God’s beloved in Rome, who are called to be saints.” Although Paul is writing to the Romans, nevertheless he indicates that he is writing to those who are in the love of God. Who are these, if not those who believe rightly concerning the Son of God? These are the ones who are holy and who are said to have been called. For someone who understands incorrectly is not said to have been called, just as those who act according to the law have not rightly understood Christ and have done injury to God the Father, by doubting whether there is full salvation in Christ. Therefore they are not holy, nor are they said to have been called.“Grace to you and peace from God our Father and the Lord Jesus Christ.” Paul says that grace and peace are with those who believe rightly. It is grace by which sinners have been cleansed and peace by which former enemies have been reconciled to the Creator, as the Lord says: “Whatever house you enter and they receive you, say: Peace be to this house.” And so as to teach that without Christ there is no peace or hope, Paul added that grace and peace are not only from God the Father but also from the Lord Jesus Christ. He says that God is our Father because of our origin, since all things are from him, and that Christ is Lord, because we have been redeemed by his blood and made children of God.

After finishing his introduction, before all else Paul bears witness to his joy, as the apostle to the Gentiles, that although the Romans ruled the world, they had submitted to the Christian faith, which seemed lowly and stupid to the wise of this world. There were many things about the Romans which he could rejoice in. They were mindful of discipline and eager to do good works, more interested in doing right than in talking about it, which is not far from God’s religion. Nevertheless, he says that most of all he rejoices in this, that word of their faith was circulating everywhere. For it seemed to be a wonderful thing, that the lords of the Gentiles should bow before a promise made to the Jews. Even if they did not believe correctly, nevertheless he was pleased that they had begun to worship one God in the name of Christ, and knew that they could advance further. For this reason he reveals his love for them, when he rejoices at their good start and encourages them to go on. He therefore says that he is giving thanks to God, even though they have not yet received everything, because God is the source of all things. The entire dispensation of our salvation is from God, indeed, but through Christ, not through the law or any prophet. Hence he says that he is giving thanks to God but through Christ, because the report of their faith was an encouragement to many to attribute this very thing to the providence of God through Christ. For either the others who believed rejoiced, having been strengthened by seeing their rulers and brothers established in the faith, or at least those who did not believe could easily have believed by following their example. For the lesser quickly does what he sees being done by the greater.

In order to encourage brotherly love, Paul gives God, whom he serves, as a witness, to whom he prays on their behalf, not in keeping the law but in the gospel of his Son, i.e., not in that which Moses the servant handed down but in that which the most beloved Son taught. For the servant is as far from his Lord as the gospel is from the law, not because the law is wrong but because the gospel is better. Therefore Paul serves God in the gospel of his Son in order to show that it is God’s will that men should believe in Christ.“Whom I serve.” How? In my spirit, says Paul, not in the circumcision made with hands, nor in new moons, nor in the sabbath or the choice of foods, but in the spirit, that is, in the mind. Because God is a spirit, it is right that he should be served in spirit or in the mind, for whoever serves him in his mind serves him in faith. This is what the Lord said to the Samaritan woman in John. … He prays without ceasing for them, remembering them in his prayers in order to sow brotherly love among them; indeed, he makes this his desire for them. For who would not love someone when he hears that that person remembers him? For if they had willingly listened to the teaching brought to them in the name of Christ by those who were not sent, how much more would they want to listen to him who they knew was an apostle and whose words were accompanied by power!