for the sexually immoral, for homosexuals, for slave-traders, for liars, for perjurers, and for any other thing contrary to the sound doctrine;

 Paul's Jewish background comes out. He says that Jesus Christ had mercy on him because he committed his sins against Christ and his Church in the days of his ignorance. We often think that the Jewish viewpoint was that sacrifice atoned for sin; a man sinned, his sin broke his relationship with God, then sacrifice was made and God's anger was appeased and the relationship restored. 