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,

 This passage begins with what was a favourite thought in the ancient world. The place of the law is to deal with evil-doers. The good man does not need any law to control his actions or to threaten him with punishments; and in a world of good men there would be no need for laws at all. 