6:7 by truthful speech. Paul will not compromise the sanctity of truth or tell a lie to accomplish some desirable goal.

the power of God. Often to work miracles, bring healing, or silence enemies (cf. Acts 14:3, 9, 10; 19:11, 12; 20:10; 28:8, 9; Rom. 15:19).

the weapons of righteousness. That is, all the weaponry to be used against human or demonic opposition (10:5, 6; Acts 13:11; 16:18; Eph. 6:10–18).