When Paul dictated these words he was nearing the close of 3 years' residence and ministry in the city of Ephesus (Acts 20:31). In his heart there was a desire to move on into Macedonia, and then to visit the church at Corinth. But while these other fields of service were beckoning him, he could not escape the sense of burden that God had given him for the city of Ephesus.
He said, "I do not wish to see you now on the way; but I hope to stay a while with you, if the Lord permits. I will tarry in Ephesus until Pentecost. For a great and effective door has opened to me, and there are many adversaries" (vv.7-9). To him, Ephesus was an open door of service which he was loathe to leave before his task was done. Tho this great missionary strategist and evangelistic preacher, an open door was God's call to live, teach, and preach the Gospel. As he visualized the metropolis of Ephesus he could say, "a great and effective door has opened to me, and there are many adversaries" (v.9).
Paul saw in the city of Ephesus: