Parts I, II, and III can be found here, here, and here, respectively.
The full form of the Jesus Prayer, “Lord Jesus Christ, Son of God, have mercy on me, a sinner,” incorporates at least six biblical promises. These are:
1. Romans 10:9 — If you confess with your mouth the Lord Jesus and believe in your heart that God has raised Him from the dead, you will be saved. (cf. John 6:40; Romans 10:10-13)
2. 1 Corinthians 12:3 — No one can say “Jesus is Lord” except in the Holy Spirit. (cf. John 15:26)
3. 1 John 5:1 — Everyone who believes that Jesus is the Christ has been born of God, and everyone who loves the Father loves whoever has been born of him. (cf. Matthew 16:16-17)
4. 1 John 4:15 — Whoever confesses that Jesus is the Son of God, God abides in him, and he in God. (cf. Romans 8:16-17; 1 John 2:23, 5:10)
5. John 14:14 — If you ask me anything in my name, I will do it. (cf. John 14:13, 15:16, 16:23-24)
6. 1 John 1:9 — If we confess our sins, he is faithful and just to forgive us our sins and to cleanse us from all unrighteousness. (cf. Luke 18:14)
On the Fourth Promise
He who confesses from the heart that Jesus is the Son of God has God abiding in him. In other words, God abiding in a man makes this confession possible. True confession is the result of God’s holy operation in the soul. And the opposite is also true: “Who is a liar but he that denieth that Jesus is the Christ? He is antichrist, that denieth the Father and the Son. Whosoever denieth the Son, the same hath not the Father” (1 John 2:22-23). In other words, those who do not confess Jesus as the Son do not have God as their Father, and in fact are opposed to the truth. And for a confession to be an authentic confession, it is not simply a matter of moving the lips, but having the heart moved by the Gospel. The heart moved by the Gospel is the heart moved by the power of God, for "the Gospel is the power of God unto salvation to everyone that believeth" (Romans 1:16). In this way the Gospel is the way of being in right relationship with divine reality. The Gospel is therefore not merely a religious message, and Christianity is not merely one way among others. There aren’t multiple true religions. One is either with Christ and God, or against Christ and God. For the whole world labors under the condemnation of sin, willingly bound to hell. But into this great spiritual slavery to evil God the Father sent His Only-Begotten Son. Christ is in this way the mercy of God extended. He is not merely a wise teacher, nor merely a miracle worker, nor merely an enlightened being. He is Himself Salvation, and He entered into the world in order to deliver those who believe in His Name. That is why Scripture says, “Neither is there salvation in any other: for there is none other name under heaven given among men, whereby we must be saved” (Acts 4:12). And so it is not simply that Christianity is a better system of ideas. It is the reality of God’s Personal in-breaking into the world to save man from a very real bondage to sin unto death and from a very real bondage to a very real Satan. Thus it cannot be said that there is no salvation in any other name as if God loves only Christians. That view of religion fails to touch the depth of the reality of the Incarnation. Christ is Himself the love of God, who is God, who came into the world to save sinners via their incorporation into Him through confessed faith, for that confession is a participation, an abiding, in Him. This promise is therefore most wonderful, for “this is the promise that he hath promised us, even eternal life” (1 John 2:25).
