Paul wanted to know if the Corinthians considered this nothing but a defense of himself.  He was speaking in the sight of God in order to develop the Corinthian community.  Was there a misunderstanding between Paul and the Corinthian community?  They were not like they wished each other to be.  There might be some problems when they would get together there, like quarreling, jealousy, anger, selfishness, slander, gossip, conceit, and disorder.  Paul was afraid that he would be humbled before God because of their unrepentant sins.