A.B. Simpson emphasizes the dual promises of Christ: His coming to us and His indwelling within us. He explains that the revelation of Christ in us is as significant as His incarnation, enabling us to be free from sin and embody His purity and strength. This transformation leads to a relinquishing of our own will, allowing us to declare, 'Not I, but Christ.' Simpson assures that through this relationship, we find rest and joy, as our efforts are replaced by abiding in Him, which naturally produces fruit in our lives.

The Bible has always held out two great promises respecting Christ. First, He will come to us. Second, He will come into us. For four thousand years the world looked forward to the fulfillment of the first promise. The other is the secret which Paul says hath been hid from ages and from generations, but now is made manifest to his saints, which is Christ in you the hope of glory (Colossians 1:26-27). This is just as great a revelation of God as the incarnation of Jesus, for it makes us like Christ, as free from sin as He is. If Christ is in us, what will be the consequences? Why, He will put us aside entirely. The I in us will go. We will say, "Not I, but Christ." Christ undertakes our battles for us. Christ becomes purity and grace and strength in us. We do not try to attain these things; we have obtained them in Jesus. This brings glorious rest with the Master. Jesus does not say, "Now we must bring forth fruit, we must pray much, we must do this or that." There is no constraint about it, except that we must abide in Him. That is the center of all joy and help.