But we all, with open face beholding as in a glass the glory of the Lord, are changed into the same image from glory to glory even as by the Spirit of the Lord. 2 Corinthians 3:18. YRP 63.1
Sin-burdened, struggling souls, Jesus in His glorified humanity has ascended into the heavens to make intercession for us. “For we have not a high priest which cannot be touched with the feeling of our infirmities; but was in all points tempted like as we are, yet without sin. Let us therefore come boldly unto the throne of grace” (Hebrews 4:15, 16). We should be continually looking unto Jesus, the Author and Finisher of our faith; for by beholding Him we shall be changed into His image, our character will be made like His. We should rejoice that all judgment is given to the Son, because in His humanity He has become acquainted with all the difficulties that beset humanity. YRP 63.2
To be sanctified is to become a partaker of the divine nature, catching the spirit and mind of Jesus, ever learning in the school of Christ. “But we all, with open face beholding as in a glass the glory of the Lord, are changed into the same image from glory to glory even as by the Spirit of the Lord.” It is impossible for any of us by our power or our own efforts to work this change in ourselves. It is the Holy Spirit, the Comforter, which Jesus said He would send into the world, that changes our character into the image of Christ; and when this is accomplished, we reflect, as in a mirror, the glory of the Lord. That is, the character of the one who thus beholds Christ is so like His, that one looking at him sees Christ's own character shining out as from a mirror. Imperceptibly to ourselves, we are changed day by day from our own ways and will into the ways and will of Christ, into the loveliness of His character. Thus we grow up into Christ, and unconsciously reflect His image. YRP 63.3
Professed Christians keep altogether too near the lowlands of earth. Their eyes are trained to see only commonplace things, and their minds dwell upon the things their eyes behold. Their religious experience is often shallow and unsatisfying, and their words are light and valueless. How can such reflect the image of Christ? How can they send forth the bright beams of the Sun of righteousness into all the dark places of the earth? To be a Christian is to be Christlike.—The Review and Herald, April 28, 1891. YRP 63.4