36. Every duty is either “ordinary” or “perfect,” Cic. de Off. I. 3, § 8. a fact which we can also confirm by the authority of the Scriptures. For we read in the Gospel that the Lord said: “If thou wilt enter into life, keep the commandments. He saith: Which? Jesus said to him: Thou shalt do no murder, Thou shalt not commit adultery, Thou shalt not steal, Thou shalt not bear false witness, Honour thy father and thy mother, Thou shalt love thy neighbour as thyself.” S. Matt. xix. 17, 18, 19. These are ordinary duties, to which something is wanting.