Ephesians 6:10
10Finally, be strong in the Lord and in the strength of his might.
“Finally” turns the church from household tables to the field. “Be strong” is a charge: nothing less will suffice for this fight, and to remain weak is the way to perish. The strength is “in the Lord” and “in the strength of his might”—grace does the enabling, not unaided will. Arminian readers insist that this might is sincerely given to believers who must take it up; remaining unarmed is neglected assistance, not a failure of the Lord’s offer.
The command is meant seriously, but the location of power is decisive: “in the Lord” and “in the strength of his might.” Weakness is assumed; God supplies the vigor. Reformed reading hears comfort before burden: the soldier does not manufacture might. Those in Christ are made strong by the Lord who already reigns over the powers named in the next verses—His provision, not our nerve, is the strength of the fight.
Key contrast Arminians detect a command that can be neglected—grace enables a fight we must actually fight. The Reformed hear the same command as a summons into God’s own power, which He actually supplies to those who are in Christ.