Servant. — More strictly, here as elsewhere in the New Testament, slave; and yet not wrongly translated “servant,” because the compulsory and degrading side of service is not put forward. The idea of “slavery” in the present day has altogether different associations.
Separated. — Compare especially Acts 13:2 (“Separate me Barnabas and Saul”), where human instruments — the leaders of the Church at Antioch — are employed to carry out the divine will. The reference here is to the historical fact of the selection of St. Paul to be an Apostle; in Galatians 1:15 (“it pleased God, who separated me from my mother’s womb”), it is rather to the more distant act of divine predestination.
Unto the gospel of God. — Singled out and set apart to convey the message of salvation from God to man. The ambiguous genitive, the gospel of God, seems to mean, “the gospel which proceeds from God,” “of which God is the author;” not “of which God is the object.”