I discipline my body and keep it under control, lest after preaching to others I myself should be disqualified (1 Corinthians 9:27). Paul, writing to the church at Corinth to correct their problems, confesses that he himself has to be careful to avoid sin. In fact Paul intimates he goes to great lengths — disciplining his body, keeping himself under control — to avoid the pitfalls of willful sin. But why? Did Paul not believe in the perseverance of the saints, or in the eternal security of believers?