For as many as have the inward dreadful apprehension of this wrath to come, and know not what to do, know that to you is Jesus Christ preached, the second Adam, a quickening spirit; and in that consideration, better than the first, – not only a living soul himself, but a spirit to quicken you who are dead in sins, – one who hath undertaken for you, and will hold you fast. Adam, who should have kept us, lost himself; Christ in a manner lost himself to save us. And as by Adam’s disobedience all this sin and misery hath abounded on man, know, that the second Adam’s obedience and righteousness are of greater virtue and efficacy to save, and instead of sin to restore righteousness, and instead of death to give life. Therefore you may come to him, and you shall be more surely kept than before.
John Calvin, commenting on Romans 5:17:
He had before declared, that the power of grace had surpassed that of sin: and by this he consoles and strengthens the faithful, and, at the same time, stimulates and encourages them to meditate on the benignity of God. Indeed the design of so studious a repetition was, — that the grace of God might be worthily set forth, that men might be led from self-confidence to trust in Christ, that having obtained his grace they might enjoy full assurance; and hence at length arises gratitude. The sum of the whole is this — that Christ surpasses Adam; the sin of one is overcome by the righteousness of the other; the curse of one is effaced by the grace of the other; from one, death has proceeded, which is absorbed by the life which the other bestows.
Source: http://www.puritanboard.com/showthread.php/89546-Christ-surpasses-Adam, Comment #1