Acts 20:29

after my departing shall grievous wolves enter in among you--Two classes of coming enemies are here announced, the one more external to themselves, the other bred in the bosom of their own community; both were to be teachers, but the one, "grievous wolves," not sparing, that is, making a prey of the flock; the other (Act 20:30), simply sectarian "perverters" of the truth, with the view of drawing a party after them. Perhaps the one pointed to that subtle poison of Oriental Gnosticism which we know to have very early infected the Asiatic churches; the other to such Judaizing tendencies as we know to have troubled nearly all the early churches. See the Epistles to the Ephesians, Colossians, and Timothy, also those to the seven churches of Asia (Rev. 2:1-3:22). But watchfulness against all that tends to injure and corrupt the Church is the duty of its pastors in every age.

In this chapter we have, I. Paul's travels up and down about Macedonia, Greece, and Asia, and his coming at length to Troas (Act 20:1-6). II. A particular account of his spending one Lord's day at Troas, and his raising Eutychus to life there (Act 20:7-12). III. His progress, or circuit, for the visiting of the churches he had planted, in his way towards Jerusalem, where he designed to be by the next feast of pentecost (Act 20:13-16). IV. The farewell sermon he preached to the presbyters at Ephesus, now that he was leaving that country (v. 17-35). V. The very sorrowful parting between him and them (Act 20:36-38). And in all these we find Paul very busy to serve Christ, and to do good to the souls of men, not only in the conversion of heathen, but in the edification of Christians.

20:29-30 vicious wolves: Paul’s prophecy did in fact happen, prompting him to write to Timothy in Ephesus some five years later (see 1 Tim 1:3-7, 19-20; 4:1-5; see also Matt 7:15; 10:16; Mark 13:22; Luke 10:3; 2 Pet 2:1-22; 3:3).