The Corinthians recognize the power of Christ, likely through the signs and wonders performed in His name. In Paul, they see only weakness. The Apostle will need to demonstrate the power of authority he has received, which operates through his apparent weakness. He is willing to bring them to judgment. However, first he offers them a chance to avoid this by examining their consciences and demonstrating their repentance. In this way, they will serve as their own judges. The standard for this self-examination should be the active, felt presence of Christ in their lives (cf. Rom 2:15-16). He ends by reaffirming his mission: to build up, not tear down (cf. 10:8).