Romans 16:17
17Now I beg you, brothers, look out for those who are causing the divisions and occasions of stumbling, contrary to the doctrine which you learned, and turn away from them.
Wesley: mark them who cause divisions—such there were at Rome also; avoid all unnecessary intercourse with them. The test is the doctrine already taught, not novelty dressed as zeal.
Watching and avoiding are responsibilities under grace. Division contrary to the gospel is not a personality clash; the church can and must refuse it without becoming factious itself.
Calvin: Satan’s ministers sow discord, drawing minds from the unity of truth, or occasion offenses that alienate from the gospel’s love—mixing truth with new dogmas, or making the gospel odious. Observe them lest they catch the unwary; shun them. The force of the passage is “which ye have learnt.”
God guards a taught church. Peace is not union in lies; the Romans must hold the orthodox faith they received and refuse those who tear it.