Commentaries:
Barnes' Notes
For a great door - There is abundant opportunity for usefulness. The word "door" is used evidently to denote an occasion or an opportunity for doing anything. It is the means by which we have entrance or access; and hence denotes facility in doing anything when there is no obstruction; see Acts 14:27; II Corinthians 2:12; Colossians 4:3.
And effectual - That is, effective, or adapted to success; presenting opportunity for great effects. There is abundant opportunity to preach the gospel; there is attention to what is spoken, and great interest in it; there is great encouragement to labor. It is possible that this was one of the reasons why Paul had changed his mind about Macedonia. It would require time to visit Corinth, as he would wish to remain there; and an unexpected opportunity having arisen for doing good, he judged it best to remain at Ephesus as long as practicable, and then to go at once to Macedonia.
And there are many adversaries - Many opposers; many who resist the gospel. These were doubtless in part Jews who excited opposition to him, and in part the friends of Demetrius; see Acts 19. That Paul had great success in Ephesus, and that his labors were attended with a great revival of religion there, is manifest from that chapter. We may remark here:
(1) That such a work of grace, such a setting open a great and effectual door, is often the occasion of increased opposition to the gospel. It is no uncommon thing that the adversaries of Christ should be excited at such times; and we are not to be surprised if the same thing should occur now which occurred in the time of Paul.
(2) This was regarded by Paul as no reason why he should leave Ephesus, but rather as a reason why he should remain there. It was regarded by him as an evidence that the Holy Spirit was there. It was proof that the enemies of God were alarmed, and that the kingdom of Christ was advancing. His presence, also, would be needed there, to encourage and strengthen the young converts who would be attacked and opposed; and he deemed it his duty to remain. A minister should never wish to make enemies to the gospel, nor seek to excite them to make opposition; but such opposition is often evidence that the Spirit of God is among a people; that the consciences of sinners are aroused and alarmed; and that the great enemy of God and man is making, as he was at Ephesus, a desperate effort to preserve his kingdom from being destroyed.
(3) A minister should regard it as his duty in a special manner to be among his people when there is such opposition excited. His presence is needed to comfort and encourage the church; and when the minds of people are excited, it is often the best time to present truth, and to defend successfully the great doctrines of the Bible.
(4) Ministers should not be discouraged because there is opposition to the gospel. It is one ground of encouragement. It is an indication of the presence of God in awakening the conscience. And it is far more favorable as a season to do good than a dead calm, and when there is universal stagnation and unconcern.
Other Barnes' Notes entries containing 1 Corinthians 16:9:
Acts 14:27
2 Corinthians 2:12
Revelation 3:8
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