Through One Man

The great theme of this passage is that the one action in history by each of two men affects a great many people. Two men, but two different men, with different actions - producing different results.
Adam's one trespass brought condemnation on all humanity; Jesus' "one act of righteousness" produced justification for many. The effect of Adam's devastating trespass was reversed through Christ's death and resurrection for all those upon whom the grace of God has been bestowed.