1. And that the Lord did not abrogate the natural [precepts] of the law, by which man is justified, which also those who were justified by faith, and who pleased God, did observe previous to the giving of the law, but that He extended and fulfilled them, is shown from His words. “For,” He remarks, “it has been said to them of old time, Do not commit adultery. But I say unto you, That every one who hath looked upon a woman to lust after her, hath committed adultery with her already in his heart.” And again: “It has been said, Thou shalt not kill. But I say unto you, Every one who is angry with his brother without a cause, shall be in danger of the judgment.” And, “It hath been said, Thou shalt not forswear thyself. But I say unto you, Swear not at all; but let your conversation be, Yea, yea, and Nay, nay.” And other statements of a like nature. For all these do not contain or imply an opposition to and an overturning of the [precepts] of the past, as Marcion’s followers do strenuously maintain; but [they exhibit] a fulfilling and an extension of them, as He does Himself declare: “Unless your righteousness shall exceed that of the scribes and Pharisees, ye shall not enter into the kingdom of heaven.” For what meant the excess referred to? In the first place, [we must] believe not only in the Father, but also in His Son now revealed; for He it is who leads man into fellowship and unity with God. In the next place, [we must] not only say, but we must do; for they said, but did not. And [we must] not only abstain from evil deeds, but even from the desires after them. Now He did not teach us these things as being opposed to the law, but as fulfilling the law, and implanting in us the varied righteousness of the law. That would have been contrary to the law, if He had commanded His disciples to do anything which the law had prohibited. But this which He did command—namely, not only to abstain from things forbidden by the law, but even from longing after them—is not contrary to [the law], as I have remarked, neither is it the utterance of one destroying the law, but of one fulfilling, extending, and affording greater scope to it.