See EGW comment on Matthew 16:22, 23.

 [Luke 22:31 quoted.] How true was the Saviour’s friendship for Peter! how compassionate His warning! But the warning was resented. In self-sufficiency Peter declared confidently that he would never do what Christ had warned him against. “Lord,” he said, “I am ready to go with thee to prison and to death.” His self-confidence proved his ruin. He tempted Satan to tempt him, and he fell under the arts of the wily foe. When Christ needed him most, he stood on the side of the enemy, and openly denied his Lord (Manuscript 115, 1902).