1 Corinthians centers on the unity and purity of the church. Throughout the letter, the apostle Paul addresses various issues and challenges facing the Corinthian church, including divisions, immorality, lawsuits, improper worship practices, and doctrinal controversies.

Paul emphasizes the importance of unity among believers, urging them to overcome divisions and live in harmony as members of the body of Christ. He also stresses the need for holiness and purity, encouraging the Corinthians to flee from sin and pursue righteousness.