Commentaries:
Robertson's Word Pictures (NT)
That—even so grace might reign (ina—outov kai h xariv basileush). Final ina here, the purpose of God and the goal for us through Christ. Lightfoot notes the force of the aorist indicative (ebasileusen, established its throne) and the aorist subjunctive (basileush, might establish its throne), the ingressive aorist both times. "This full rhetorical close has almost the value of a doxology" (Denney).
Other Robertson's Word Pictures (NT) entries containing Romans 5:21:
Romans 5:12
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