A minister of God (qeou diakono). General sense of diakono. Of course even Nero was God's minister "to thee (soi ethical dative) for good (ei to agaqon, for the good)." That is the ideal, the goal. Beareth (porei). Present active indicative of porew, old frequentative form of perw, to bear, to wear. But if thou do (ean de poih). Condition of third class, ean and present active subjunctive of poiew, "if thou continue to do." Sword (macairan). Symbol of authority as to-day policemen carry clubs or pistols. "The Emperor Trajan presented to a provincial governor on starting for his province, a dagger, with the words, 'For me. If I deserve it, in me'" (Vincent). An avenger (ekdiko). Old adjective from ek and dikh (right), "outside of penalty," unjust, then in later Greek "exacting penalty from one," in N.T. only here and 1 Thessalonians 4:6 .