Romans 1:1
1Paul, a servant of Jesus Christ, called to be an apostle, set apart for the Good News of God,
Wesley: Paul, a servant of Jesus Christ—called to be an apostle, and made an apostle by that calling. While God calls, he makes what he calls. Separated by God, not only from other men and other teachers, to be a peculiar instrument in spreading the gospel.
Arminian interpreters hear vocation as God’s making, not Paul’s self-appointment. The office is gift; do not invent a Pelagian Paul who climbed into apostleship. “Called” here is commission to preach the gospel of God, so that the nations may hear and believe. Set apart is unto a public message, not a private honor.
Calvin: by saying servant of Christ, Paul named what he shared with other teachers; by claiming Apostle he put himself before others; yet no authority is due to one who willfully intrudes, so he reminds us he was appointed by God.
The gospel is God’s, and the messenger is God’s appointment. Set apart is not a human career. The same God who sends the apostle is the God who will love and call a people (v. 7). Apostleship is given; it is not seized.