Read Acts 19.
The city of Ephesus occupied an important place in the New Testament, and here in Acts 19 we read about Paul’s first contact with this city. You know about the letter we call “Ephesians” that Paul wrote to the church there. He also sent Timothy there, in his place, later on Paul also wrote and sent the letters we call 1 & 2 Timothy to him while Timothy was in Ephesus. Finally, Ephesus was one of the seven churches in Revelation that Jesus spoke to (Rev 2:1). So we read in this chapter the origin story of what would become an important church in the New Testament days.
Things began powerfully there. Paul arrived in Ephesus and found twelve men (v. 7) who were described as “disciples” (v. 1). They were disciples of John, however, because they had not yet heard of Jesus (v. 4). Still, they were faithful to the truth they did have which was the teaching and baptism of John. God sent Paul to them to complete their discipleship by bringing them to Jesus (v. 4) and, when he taught them the gospel they showed the same signs of faith that the original disciples showed (Acts 2:4) and the first Gentile believers also showed (Acts 10:44-48, 11:15-18).
After three months of teaching in the synagogue (v. 8), Paul faced opposition–first from the Jews who did not receive Jesus (v. 9), then from Jewish leaders who tried to claim Jesus’ power for their own reasons (vv. 13-16), then the idol worshipping Gentiles who saw their livelihood threatened (vv. 17-41). God used Paul powerfully both to do miracles delivering people from Satan’s power (vv. 11-12) and to spread the gospel to the region around Ephesus (vv. 9-10). But, God did all of that in the middle of strong opposition from many sides.
That seems to be a pattern throughout church history; wherever God is working powerfully, Satan is always bringing strong opposition from as many directions as possible. It makes sense–doesn’t it?–that Satan would push back as powerfully as he can where God is working powerfully.
So don’t be discouraged if God is using you in the lives of others. There will be opposition and the enemy will seek to discourage you and derail your faithfulness. Just keep doing what God is blessing and keep praying for his power to overcome the opposition you face.