33 Peter answered and said to Him, "Even if all are made to stumble because of You, I will never be made to stumble." 34 Jesus said to him, "Assuredly, I say to you that this night, before the rooster crows, you will deny Me three times." 35 Peter said to Him, "Even if I have to die with You, I will not deny You!" And so said all the disciples.
Matthew Henry's Commentary on Matthew 26:33-35
Commentary on Matthew 26:31-35
(Read Matthew 26:31-35)
Improper self-confidence, like that of Peter, is the first step to a fall. There is a proneness in all of us to be over-confident. But those fall soonest and foulest, who are the most confident in themselves. Those are least safe, who think themselves most secure. Satan is active to lead such astray; they are most off their guard: God leaves them to themselves, to humble them.