If another member of the church sins against you, go and point out the fault when the two of you are alone. If the member listens to you, you have regained that one.
Moreover if thy brother shall trespass against thee, go and tell him his fault between thee and him alone: if he shall hear thee, thou hast gained thy brother.
If another believer sins against you, go privately and point out the offense. If the other person listens and confesses it, you have won that person back.
See what love the Father has given us, that we should be called children of God; and that is what we are. The reason the world does not know us is that it did not know him.