"Transformation of character is to be the testimony to the world of the indwelling love of Christ. The Lord expects His people to show that the redeeming power of grace can work upon the faulty character and cause it to develop in symmetry and abundant fruitfulness. 6T 43.1"
"Therefore if any man be in Christ, he is a new creature: old things are passed away; behold, all things are become new."
Both passages discuss the transformation of character that occurs when someone is in Christ. EGW speaks of the 'transformation of character' and the development of a 'faulty character' into one of 'symmetry and abundant fruitfulness,' while 2 Corinthians 5:17 states that being 'in Christ' makes one a 'new creature' and that 'old things are passed away.' EGW is expanding on the principle of transformation in Christ.
"But the fruit of the Spirit is love, joy, peace, longsuffering, gentleness, goodness, faith, Meekness, temperance: against such there is no law."
The EGW passage directly echoes the concept of 'fruit' and character transformation found in Galatians 5:22-23, which lists the fruits of the Spirit. The idea of a character developing in 'symmetry and abundant fruitfulness' is a clear parallel.
"But in order for us to fulfill God's purpose, there is a preparatory work to be done. The Lord bids us empty our hearts of the selfishness which is the root of alienation. He longs to pour upon us His Holy Spirit in rich measure, and He bids us clear the way by self-renunciation. When self is surrendered to God, our eyes will be opened to see the stumbling stones which our un-Christlikeness has placed in the way of others. All these God bids us remove. He says: “Confess your faults one to another, and pray one for another, that ye may be healed.” James 5:16 . Then we may have the assurance that David had when, after confession of his sin, he prayed: “Restore unto me the joy of Thy salvation; and uphold me with Thy free Spirit. Then will I teach transgressors Thy ways; and sinners shall be converted unto Thee.” Psalm 51:12, 13 . 6T 43.2"
"Confess your faults one to another, and pray one for another, that ye may be healed. The effectual fervent prayer of a righteous man availeth much."
Ellen White directly references James 5:16 in this passage.