We exist to correct, convert, take those separated from God by their own sins and join them to God, for union with God is the reason for which we were all created.
Today's Apostle in the Byzantine liturgical Rite:
2 Timothy 3:16-4:4
All scripture, inspired of God, is profitable to teach, to reprove, to correct, to instruct in justice, That the man of God may be perfect, furnished to every good work. I charge thee, before God and Jesus Christ, who shall judge the living and the dead, by his coming, and his kingdom: Preach the word: be instant in season, out of season: reprove, entreat, rebuke in all patience and doctrine. For there shall be a time, when they will not endure sound doctrine; but, according to their own desires, they will heap to themselves teachers, having itching ears: And will indeed turn away their hearing from the truth, but will be turned unto fables.