as knowing this, that law is not made for a righteous man, but for the lawless and insubordinate, for the ungodly and sinners, for the unholy and profane, for murderers of fathers and murderers of mothers, for manslayers,

 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. 