Bede the Venerable
Catena Aurea · Lukasevangelium 22
And the Lord said, Simon, Simon, behold, Satan hath desired to have you, that he may sift you as wheat: But I have prayed for thee, that thy faith fail not: and when thou art converted, strengthen thy brethren. And he said unto him, Lord, I am ready to go with thee, both into prison, and to death. And he said, I tell thee, Peter, the cock shall not crow this day, before that thou shalt thrice deny that thou knowest me.
Because the Lord said He had prayed for Peter’s faith, Peter conscious of present affection and fervent faith, but unconscious of his coming fall, does not believe he could in any way fall from Christ. As it follows, And he said unto him, Lord, I am ready to go with thee to prison and to death.