Main Answer
Paul ends the armour passage with prayer because spiritual readiness depends on ongoing communion with God and concern for the whole church. Prayer surrounds the armour rather than appearing as an optional extra.
After listing truth, righteousness, peace, faith, salvation and the Word, Paul tells believers to pray always with perseverance for all saints. He even asks for prayer for his own courage in speaking the gospel. For Why Does Paul End the Armour of God With Prayer in Ephesians 6:18?, use this point only where it genuinely fits the passage and the responsibility being considered.
Prayer prevents the armour from becoming a private self-defence technique. The believer stands with other Christians and asks God for strength, wisdom and boldness.
Prayer is not a substitute for practical responsibility. The same letter contains extensive instruction about speech, relationships and conduct, so prayer should energise obedience rather than replace it.
For a related free study, read What Does “Kept by the Power of God Through Faith” Mean in 1 Peter 1:5?.
For a fuller guided study, see Uncovering Faith: A Christian Devotional on The Armour of God (available to our members also).
The Extra Study below examines Ephesians 6:18-20 more closely and applies it to the exact question raised here.
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