Then Peter said unto them, Repent, and be baptized every one of you in the name of Jesus Christ for the remission of sins, and ye shall receive the gift of the Holy Ghost. -- Acts 2:38 (KJV)
“Ye shall receive.” Peter says it to a crowd that has just been cut to the heart, and then he widens it in the next breath: “the promise is unto you, and to your children, and to all that are afar off, even as many as the Lord our God shall call.” The gift has a future tense in it. It was never a transaction that closed behind you.
Hold that beside Ephesians 6 and go back through the equipment asking one question of each piece. Whose is it?
Ye Shall Receive
Truth is God's. Righteousness is Christ's, credited. The gospel of peace was His message long before it was your footing. Faith is given. Salvation obviously so. And the sword belongs to the Spirit outright — Paul says as much in the verse where he names it. Six pieces, and the soldier supplies none of them.
Which explains how Paul frames the passage. He opens it with strength “in the Lord, and in the power of his might,” and closes it with “praying always with all prayer and supplication in the Spirit.” The Holy Ghost stands at both ends. What runs between them is that same strength itemized, then handed back to God in prayer.
So the armour is what a Spirit-filled life looks like when the day leans on it. Which makes the real failure subtler than forgetting the list.
A man can carry the whole outline of a Christian morning on willpower. He can be correct, be early, be pleasant, and be running on what God did in him a month ago. The names of the pieces are the easy part. Staying full is the part that has to happen again, and it does not carry over.
Repent when the heart cools. Keep the name of Jesus over the day. Make room for the Spirit who was given rather than only discussed.
The question is present tense. Are you full right now?