1. Brothers should not sue brothers (1-6)
Problems between Christians should be solved in God's way. It is shameful for a believer to sue a fellow believer in a pagan court. A fellow Christian should mediate in a dispute between brothers. Someday, Jesus' people will join Jesus in judging the world. So even the least Christian should be wise enough to settle a dispute. God's people must not let material things damage their relationships with one another--this goes against God's creation order.
2. Remember what you were (7-11)
Here is a list of the kind of people who cannot inherit the kingdom of God. The list includes the sexually immoral, the greedy, homosexuals, drunkards, slanderers, thieves, etc. Then Paul says--'That is what some of you were.' The Christian fellowship is a gathering of forgiven sinners, washed clean by the blood of Jesus.
Application: Lord, help me to remember your great grace and help others humbly and prayerfully.
One Word: Remember who you were--and are