romans 5:18 Therefore as by the offence of one judgment came upon all men to condemnation; even so by the righteousness of one the free gift came upon all men unto justification of life. - Free Bible Online

      18. Therefore--now at length resuming the unfinished comparison of Ro 5:12, in order to give formally the concluding member of it, which had been done once and again substantially, in the intermediate verses.
      as by the offence of one judgment came--or, more simply, "it came."
      upon all men to condenmation; even so by the righteousness of one the free gift came--rather, "it came."
      upon all men to justification of life--(So CALVIN, BENGEL, OLSHAUSEN, THOLUCK, HODGE, PHILIPPI). But better, as we judge: "As through one offense it [came] upon all men to condemnation; even so through one righteousness [it came] upon all men to justification of life"--(So BEZA, GROTIUS, FERME, MEYER, DE WETTE, ALFORD, Revised Version). In this case, the apostle, resuming the statement of Ro 5:12, expresses it in a more concentrated and vivid form--suggested no doubt by the expression in Ro 5:16, "through one offense," representing Christ's whole work, considered as the ground of our justification, as "ONE RIGHTEOUSNESS." (Some would render the peculiar word here employed, "one righteous act" [ALFORD, &c.]; understanding by it Christ's death as the one redeeming act which reversed the one undoing act of Adam. But this is to limit the apostle's idea too much; for as the same word is properly rendered "righteousness" in Ro 8:4, where it means "the righteousness of the law as fulfilled by us who walk not after the flesh, but after the Spirit," so here it denotes Christ's whole "obedience unto death," considered as the one meritorious ground of the reversal of the condemnation which came by Adam. But on this, and on the expression, "all men," see on Ro 5:19. The expression "justification of life," is a vivid combination of two ideas already expatiated upon, meaning "justification entitling to and issuing in the rightful possession and enjoyment of life").

JFB.