Adam Clarke on Matthew 26:34

Jesus said - Our Lord's answer to Peter is very emphatic and impressive. Verily - I speak a solemn weighty truth, thou wilt not only be stumbled, fall off, and forsake thy Master, but thou wilt even deny that thou hast, or ever had, any knowledge of or connection with me; and this thou wilt do, not by little and little, through a long process of time, till the apostasy, daily gathering strength, shall be complete; but thou wilt do it this very night, and that not once only, but thrice; and this thou wilt do also in the earlier part of the night, before even a cock shall crow. Was not this warning enough to him not to trust in his own strength, but to depend on God?