It is so with the soul. The heart is to be carefully kept and guarded. “What shall it profit a man, if he shall gain the whole world, and lose his own soul? Or what shall a man give in exchange for his soul?” Mark 8:36, 37. Christ must abide in the heart by faith. His word is the bread of life and the water of salvation. Trust in its fullness comes to us through constant communion with God. By eating the flesh and drinking the blood of Christ we gain spiritual strength. Christ supplies the lifeblood of the heart, and Christ and the Holy Spirit give nerve power. Begotten again unto a lively hope, imbued with the quickening power of a new nature, the soul is enabled to rise higher and still higher. Paul’s prayer to God for the Ephesians was, “That He would grant you, according to the riches of His glory, to be strengthened with might by His Spirit in the inner man; that Christ may dwell in your hearts by faith; that ye, being rooted and grounded in love, may be able to comprehend with all saints what is the breadth, and length, and depth, and height; and to know the love of Christ, which passeth knowledge, that ye might be filled with all the fullness of God.” Ephesians 3:16-19.