33 But Peter answered him, “Even if all will be made to stumble because of you, I will never be made to stumble.” 34 Jesus said to him, “Most certainly I tell you that tonight, before the rooster crows, you will deny me three times.” 35 Peter said to him, “Even if I must die with you, I will not deny you.” All of the disciples also said likewise.
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.