Paul's relationship with the Corinthian congregation has deteriorated. In 2 Corinthians, the apostle seeks to rebuild his relationship with the Corinthians, to defend his own integrity as a trustworthy and competent servant of Christ, and to refute what he perceives as the claims by other evangelists of background and gifts that are superior to his own. Paul also encourages the Corinthians to continue collecting funds for the Jerusalem churches. To do these things, Paul makes extensive use of autobiography, writing both about hardships and mystical experience. His tone changes dramatically throughout this letter, shifting from well-reasoned argument, to appeals for affection, to attacks on opponents. Because of the changes in tone as well as puzzling jumps between topics, many interpreters believe that what we call 2 Corinthians is actually a combination of multiple letters from Paul to the Corinthian church.