1 Corinthians 6:1-6
1 “Does any one of you, when he has a case against his neighbor, dare to go to law before the unrighteous and not before the saints? 2 Or do you not know that the saints will judge the world? If the world is judged by you, are you not competent to form the smallest law courts? 3 Do you not know that we will judge angels? How much more matters of this life? 4 So if you have law courts dealing with matters of this life, do you appoint them as judges who are of no account in the church? 5 I say this to your shame. Is it so, that there is not among you anyone wise who will be able to decide between his brothers and sisters, 6 but brother goes to law with brother, and that before unbelievers?”
Saints will judge the world: Believers will be judging the world on behalf of God during the Great White Throne judgment. This is because there is not condemnation for the believer who has been made completely righteous through the completed salvific work of Christ (see 2 Corinthians 5:21). Paul wanted the Corinthian believers to keep this in mind as they were taking each other to court outside of the church. Paul believed the Corinthian Christians to be better than this type of behavior.
Are you not competent: Believers will judge angels and the world. Therefore, Paul concludes that they ought to be able to work through their petty differences without involving the legal system. Paul is casting a vision about how to best relate to fellow believers. If we pursue unity and love, then we will prevent fractures occurring in our relationships.