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. CH 593.1
The blessing of grace is given to men that the heavenly universe and the fallen world may see as they could not otherwise, the perfection of Christ's character. The Great Physician came to our world to show men and women that through His grace they may so live that in the great day of God they can receive the precious testimony, “Ye are complete in Him.” CH 593.2
Physicians are to reveal the attributes of Christ, steadfastly persevering in the work God has given them to do. To those who do this work in faithfulness, angels are commissioned to give enlarged views of the character and work of Christ and His power, grace, and love. Thus they become partakers of His image, and day by day grow up to the full stature of men and women in Christ. It is the privilege of the children of God to have a constantly enlarging comprehension of truth, that they may bring love for God and heaven into the work, and draw from others thanksgiving to God because of the richness of His grace. CH 593.3
We have reason for everlasting gratitude to God in that He has left us a perfect example. Every Christian should strive to earnestly follow in the footsteps of the Saviour. We should offer grateful praise and gratitude for giving us such a mighty helper, a safeguard against every temptation, against every species of impropriety in thought, deed, and word. CH 594.1
Our only security against falling into sin is to keep ourselves continually under the molding influence of the Holy Spirit, at the same time engaging actively in the cause of truth and holiness, discharging every God-given duty, but taking no burden which God has not laid upon us. Physicians must stand firmly under the banner of the third angel's message, fighting the good fight of faith perseveringly and successfully, relying on a heavenly armor, the equipment of God's word, never forgetting that they have a leader who never has been and never can be overcome by evil. CH 594.2