"ability as a manager. Judas regarded himself as the capable one, who could not be overreached. In his own estimation he was an honor to the cause, and as such he always represented himself. DA 717.1"
"For I say, through the grace given unto me, to every man that is among you, not to think of himself more highly than he ought to think; but to think soberly, according as God hath dealt to every man the measure of faith."
The EGW passage illustrates the principle of not thinking more highly of oneself than one ought to think, which is the core message of Romans 12:3. Judas's self-estimation as a capable manager who could not be overreached directly contradicts the humility encouraged in Romans 12:3.
"Judas was blinded to his own weakness of character, and Christ placed him where he would have an opportunity to see and correct this. As treasurer for the disciples, he was called upon to provide for the needs of the little company, and to relieve the necessities of the poor. When in the Passover chamber Jesus said to him, “That thou doest, do quickly” ( John 13:27 ), the disciples thought He had bidden him buy what was needed for the feast, or give something to the poor. In ministering to others, Judas might have developed an unselfish spirit. But while listening daily to the lessons of Christ and witnessing His unselfish life, Judas indulged his covetous disposition. The small sums that came into his hands were a continual temptation. Often when he did a little service for Christ, or devoted time to religious purposes, he paid himself out of this meager fund. In his own eyes these pretexts served to excuse his action; but in God's sight he was a thief. DA 717.2"
"And after the sop Satan entered into him. Then said Jesus unto him, That thou doest, do quickly."
Ellen White directly references John 13:27 in this passage.