A.T. Robertson Commentary Romans 5:18

"So then as through one trespass [the judgment came] unto all men to condemnation; even so through one act of righteousness [the free gift came] unto all men to justification of life." — Romans 5:18 (ASV)

So then (αρα ουν). Conclusion of the argument. Cf. 7:3,25; 8:12, etc. Paul resumes the parallel between Adam and Christ begun in verse 12 and interrupted by explanation (13f.) and contrast (15-17).

Through one trespass (δι' ενος παραπτωματος). That of Adam.

Through one act of righteousness (δι' ενος δικαιωματος). That of Christ. The first "unto all men" (εις παντας ανθρωπους) as in verse 12, the second as in verse 17 "they that receive, etc."