The answer is: Corinth

Acts 18: 8,9

Paul’s time in Corinth marks a significant moment in his missionary journeys, ultimately revealing a lot about the early Christian church's development and Paul’s own mission. When God spoke to him in a vision there, Paul was likely experiencing great distress due to mounting opposition. He wasn't just trying to spread the Gospel in a city notorious for its immorality and idolatry; he was shaking off waves of rejection from surrounding communities.

What’s particularly intriguing about Corinth is that it was a bustling commercial center, shaped by diverse cultures and religions. The Corinthian church was filled with new believers grappling with faith while being immersed in a complicated social landscape - something Paul recognized as instrumental to his ministry. This mission wasn't just a personal endeavor; it was a strategic outreach meant to reach people from all walks of life.

Trivia nugget – Did you know that the phrase “to act like a Corinthian” in ancient times was synonymous with living immorally? Yet, in the face of adversity and opposition, Paul remained undeterred. In that divine vision, he was assured that he would not face harm, which led him to stay in Corinth for an extended period, about a year and a half, helping to establish a solid Christian community.

This episode brings out the theme of perseverance in faith—sometimes we need that divine encouragement to take heart, especially amidst trials and uncertainties. Paul’s emphasis on unity and love later formed the core principles of his letters to the Corinthians, guiding early Christians in fostering a community reflective of higher moral vs. societal standards.