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When Peter said he would follow his Lord to prison and to death, he meant it, every word of it; but he did not know himself. Hidden in his heart were elements of evil that circumstances would fan into life. Unless he was made conscious of his danger, these would prove his eternal ruin. The Saviour saw in him a self-love and assurance that would overbear even his love for Christ. Much of infirmity, of unmortified sin, carelessness of spirit, unsanctified temper, heedlessness in entering into temptation, had been revealed in his experience. Christ’s solemn warning was a call to heart searching. Peter needed to distrust himself, and to have a deeper faith in Christ. Had he in humility received the warning, he would have appealed to the Shepherd of the flock to keep His sheep. When on the Sea of Galilee he was about to sink, he cried, “Lord, save me.” Matthew 14:30 . Then the hand of Christ was outstretched to grasp his hand. So now if he had cried to Jesus, Save me from myself, he would have been kept. But Peter felt that he was distrusted, and he thought it cruel. He was already offended, and he became more persistent in his self-confidence. – {DA 673.3}
Jesus looks with compassion on His disciples. He cannot save them from the trial, but He does not leave them comfortless. He assures them that He is to break the fetters of the tomb, and that His love for them will not fail. “After I am risen again,” He says, “I will go before you into Galilee.” Matthew 26:32. Before the denial, they have the assurance of forgiveness. After His death and resurrection, they knew that they were forgiven, and were dear to the heart of Christ. – {DA 674.1}
Desire of Ages, Ellen G. White, 1898, pg. 673, 674