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. AG 233.1
The work of transformation from unholiness is a continuous one. Day by day God labors for man's sanctification, and man is to co-operate with Him, putting forth persevering efforts in the cultivation of right habits. He is to add grace to grace; and as he thus works on the plan of addition, God works for him on the plan of multiplication. Our Saviour is always ready to hear and answer the prayer of the contrite heart, and grace and peace are multiplied to His faithful ones. Gladly He grants them the blessings they need in their struggle against the evils that beset them.38The Acts of the Apostles, 532. AG 233.2
John and Judas are representatives of those who profess to be Christ's followers. Both these disciples had the same opportunities to study and follow the divine Pattern. Both were closely associated with Jesus and were privileged to listen to His teaching. Each possessed serious defects of character; and each had access to the divine grace that transforms character. But while one in humility was learning of Jesus, the other revealed that he was not a doer of the Word, but a hearer only. One, daily dying to self and overcoming sin, was sanctified through the truth; the other, resisting the transforming power of grace and indulging selfish desires, was brought into bondage to Satan. AG 233.3
Such transformation of character as is seen in the life of John is ever the result of communion with Christ. There may be marked defects in the character of an individual, yet when he becomes a true disciple of Christ, the power of divine grace transforms and sanctifies him. Beholding as in a glass the glory of the Lord, he is changed from glory to glory, until he is like Him whom he adores.... AG 233.4
God can be honored by those who profess to believe in Him, only as they are conformed to His image and controlled by His Spirit. Then, as witnesses for the Saviour, they may make known what divine grace has done for them.39The Acts of the Apostles, 558, 559. AG 233.5