Eph. 3:16-17a That He would grant you, according to the riches of His glory, to be strengthened with power through His Spirit into the inner man, that Christ may make His home in your hearts through faith.
Our heart is composed of all the parts of our soul — mind, emotion, and will — plus our conscience, the main part of our spirit. These parts are the inward parts of our being. Through regeneration Christ came into our spirit (2 Tim. 4:22). After this, we should allow Him to spread into every part of our heart. Since our heart is the totality of all our inward parts and the center of our inward being, when Christ makes His home in our heart, He controls our entire inward being and supplies and strengthens every inward part with Himself. (Eph. 3:17, footnote 1, Recovery Version)