Ephesians in general and its “armor” passage (6:10-20) in particular devote a major focus to the importance of prayer in Christian life and ministry. The power in the armor is essential if believers are to win the battle against Satan and his demonic forces. The parts of the armor denote different spiritual aspects of Christian living that are also essential. None of the above can be appropriated without prayer modeled according to the principles of Scripture. Eleven considerations show prayer to be inseparable from victory in spiritual warfare. The uses of “all” in Eph 6:18 are a call to an “all-out” commitment to prayer and remind Christian soldiers of its crucial importance.