For God is my witness, whom I serve with my spirit in the gospel of his Son, that without ceasing I make mention of you always in my prayers;
All Commentaries on Romans 1:9 Go To Romans 1
Ambrosiaster
AD 400
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! Commentary on Paul’s Epistles.