Paul’s defense is really not a self-defense, but a defense of the gospel. Because his defense is Jesus Christ. His faithfulness is his problem, not any sin on his part. Then, as now, people want Christ on their own terms, not on His. As a result, there was no desire to have Christ in terms of scripture in Corinth, but only in terms of themselves. They wanted salvation but no commitment. They wanted to say yes to Jesus, but their yes did not mean obedience.