Jesus answered him,
Will you lay down your life for my sake? Verily, verily, I say unto you, The cock shall not crow, till you have denied me three times.
Read Chapter 13
Cornelius a Lapide
AD 1637
Jesus answered him: Layest thou thy life down for Me? Verily I say unto thee, The cock shall not crow before thou deny Me thrice. Christ humbles Peter, who trusts too much in himself, and suffers him to fall, that he may learn to confide not in his own strength but in the grace of Christ. Wherefore Christ repeatedly made this prediction to Peter. Hear S. Chrysostom (Hom72), "Thou shalt know by experience that thy love is nothing without Divine grace. And hence it appears that Jesus permitted this fall for his benefit."
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Wonderful as the zeal of Peter in this matter may be, his promises are beyond his power to fulfil: Christ, however, with the gloom of the threatening tempest in His mind, knowing well how severe will be the temptation and how bitter the persecution, seems as it were to shake His head in sorrow; and then, unfolding to Himself the whole extent of His sufferings, as though it were present to His bodily eyes, beholding the surpassing fury of the Jews in their madness, and seeing clearly all that will come to pass in that hour, He exclaims as though to say: "Dost thou, O Peter, lay down thy life for Me, and sayest thou that thy fear in this matter is as nothing? and supposest thou that thou wilt be strong enough to overcome the trials that will encompass thee? Nay, thou knowest not the grievous weight of the coming temptation, for the suffering that lies before thee is beyond thy strength to endure: thy heart shall fail thee utterly, even though thou wouldst not have it so: thrice shalt tho...
The love which St. Peter bore our Saviour was exceedingly tender, but it was not yet sufficiently strong. (St. Bernard, Serm. iv. in Cant.)
Jesus therefore asks him, Wilt thou lay down thy life for me? Do you think yourselves sufficiently strong to perform this heroic act for love of me? so far are you from exposing your life for me, that you will shortly deny me. (Menochius)