The city of Corinth was at the heart of an important trade route in the ancient world. Like many cities that thrive on trade, Corinth had a reputation for sexual immorality, religious diversity, and corruption. The church that Paul planted there (Acts 18) floundered under all of these influences and began to divide over various issues. First Corinthians addresses many practical questions dividing the church-questions concerning such things as spiritual gifts, marriage, food offered to idols, and the resurrection. Paul urged the Corinthians to be unified and to give themselves fully to "the work of the Lord" (15:58). Chapter 13 includes a well-known passage on the nature and importance of love. Paul wrote this letter to the Corinthians from Ephesus about a.d. 55.