William Burkitt on Luke 22:33

St. Peter's resolution to accompany Christ both to prison and to death, was holy and good; but his too confident opinion of his own strength and ability so to do, without a divine aid and assistance, was his failing and infirmity. Self-confidence is a sin, too, incident to the holiest and best of men. Little did St. Peter think what a feather he should be in the wind of temptation, if once God left him to himself, and to Satan's assaults.

Learn farther, how hard a matter it is for a Christian to excel in gifts, and not to be overconfident and conceited. To see a man eminent in gifts, and yet exemplary in humility, is a rare sight; if we stand in the evil day, it is an humble fear of falling that must enable us to stand.