So then as through one trespass, all men were condemned; even so through one act of righteousness, all men were justified to life.
COMPARISON AND CONTRAST BETWEEN ADAM AND CHRIST IN THEIR RELATION TO THE HUMAN FAMILY. (Rom 5:12-21) Wherefore--that is, Things being so; referring back to the whole preceding argument. as by one man--Adam. sin--considered here in its guilt, criminality, penal desert. entered into the world, and death by sin--as the penalty of sin.
Commenting on Romans 5:12-21
Therefore--now at length resuming the unfinished comparison of Rom 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...
Observe, here, How the apostle informs us of a truth, which all the writing of philosophers never acquainted us with; namely, the meritorious imputation of Adam's sin to all his posterity; that all mankind sinned in Adam, and became obnoxious to death, and all other calamities and miseries, as a punishment for their sin.