1 Corinthians 6:5

To your shame. Paul has dealt with the situation regarding lawsuits between brethren as plainly and forcefully as possible, in order to move the church members to a feeling of shame. He desired them to realize that they were not setting an example of victorious Christian living before the heathen. Church members should keep personal feelings and desires in subjection and give priority to the things that concern the welfare of the church. Differences between brethren must not be allowed to overshadow the good of the church.

Wise man. The Corinthians boasted of their wisdom and intelligence, and considered themselves superior to other people around them. If that was so, then surely they would be able to find someone in the church who could make wise and just decisions concerning differences between brethren. If their city was as refined and enlightened as they claimed it to be, it would indeed be strange if they could not appoint one of the church members to settle their troubles, one in whom the brethren would have confidence, one whose judgments would be accepted by the contending parties. It is not hard to see the somewhat sarcastic reproof that Paul here administers.