Passage: Romans 5 (ESV Bible Online).

Commentators agonize over why Paul says, “Therefore…” in Romans 5.12.

But surely the reason is in 5.1-11.  We were justified when death and sin were at their high point, when we were “weak” and “still sinners.”  And we can be sure that we will move from victory to victory, even through tribulation, from this point on.

So in 5.12, Paul is saying, Therefore this means that Christ’s obedience is bringing about a righteousness much greater than the condemnation from Adam’s disobedience.  Paul is “standing back,” so to speak, and showing that the victory we have been given and can expect in 5.1-11, means that sin and death and condemnation are defeated early and overwhelmingly in the course of human history.

Yes, it is all about how postmillennialism is true.