“The Lord said to Paul by a vision in the night, ‘Do not be afraid, but speak and do not be silent, because I am with you, and no one will assault you to harm you, because I have many people in this city.'”
Many people had already been immersed in Corinth, and opposition was fierce. The door of opportunity, however, was still open. People were receptive. Paul should continue to proclaim the gospel. The Lord foresaw still more conversions.
We do not have today visions from the Lord about a city’s receptivity. We do have his mission. “… when God gives a man his task to do, he also gives him the power to do it. In the presence of God Paul found his courage and his strength” (Wm. Barclay).