Why do we still have moral issues in the church, despite the fact that we believe the gospel is true? The Corinthians church is one example of immorality within the church, and these issues were not limited to New Testament believers. The purpose of 1 Corinthians (Good Book Guides) is to explain the problems that the Corinthians are facing and how the apostle Paul deals with them, so that we can learn how to deal with the same problem of immorality today.