At the end of 1 Corinthians 6, Paul includes a list of sins that define those who will not inherit the Kingdom of God: fornicators, idolaters, adulterers, effeminate, abusers of themselves with mankind, thieves, covetous, drunkards, revilers, extortioners. What is interesting, though, is that this list is tacked onto the backend of Paul's condemnation of believers suing other believers in court. The principal lesson of that condemnation focuses on unforgiveness, through which Paul is saying that unforgiveness is among the list of sins that define an UNSAVED person if it is the general pattern of their life. Since true believers have experienced the unfathomable forgiveness of God in salvation, they will, by their new nature in Christ, be more willing to forgive than to claim their own rights. This principle is clearly illustrated in Christ's Parable of the Unforgiving Servant.