This sin was very common before the light of the Gospel appeared. When I was a child there were many witches and sorcerers around who “bewitched” cattle, and people, particularly children, and did much harm. But now that the Gospel is here you do not hear so much about it because the Gospel drives the devil away. Now he bewitches people in a worse way with spiritual sorcery. LOG 229.1
Witchcraft is a brand of idolatry. As witches used to bewitch cattle and men, so idolaters, i.e., all the self-righteous, go around to bewitch God and to make Him out as one who justifies men not by grace through faith in Christ but by the works of men’s own choosing. They bewitch and deceive themselves. If they continue in their wicked thoughts of God they will die in their idolatry. LOG 229.2
Sects
Under sects Paul here understands heresies. Heresies have always been found in the church. What unity of faith can exist among all the different monks and the different orders? None whatever. There is no unity of spirit, no agreement of minds, but great dissension in the papacy. There is no conformity in doctrine, faith, and life. On the other hand, among evangelical Christians the Word, faith, religion, sacraments, service, Christ, God, heart, and mind are common to all. This unity is not disturbed by outward differences of station or of occupation. LOG 229.3