5:12-14 The design of what follows is plain. It is to exalt our views respecting the blessings Christ has procured for us, by comparing them with the evil which followed upon the fall of our first father; and by showing that these blessings not only extend to the removal of these evils, but far beyond. Adam sinning, his nature became guilty and corrupted, and so came to his children. Thus in him all have sinned. And death is by sin; for death is the wages of sin. Then entered all that misery which is the due desert of sin; temporal, spiritual, eternal death. If Adam had not sinned, he had not died; but a sentence of death was passed, as upon a criminal; it passed through all men, as an infectious disease that none escape. In proof of our union with Adam, and our part in his first transgression, observe, that sin prevailed in the world, for many ages before the giving of the law by Moses. And death reigned in that long time, not only over adults who wilfully sinned, but also over multitudes of infants, which shows that they had fallen in Adam under condemnation, and that the sin of Adam extended to all his posterity. He was a figure or type of Him that was to come as Surety of a new covenant, for all who are related to Him.
13, 14. For until the law sin was in the world—that is during all the period from Adam "until the law" of Moses was given, God continued to treat men as sinners.
but sin is not imputed where there is no law—"There must therefore have been a law during that period, because sin was then imputed"; as is now to be shown.