Peter answered Though all men - The word "men" is improperly inserted here by the translators. Peter meant only to affirm this of "the disciples." This confidence of Peter was entirely characteristic. He was ardent, sincere, and really attached to his Master. Yet this declaration was made evidently:
1. from true love to Jesus;
2. from too much reliance upon his own strength;
3. from ignorance of himself, and of the trials which he was soon to pass through.
And it most impressively teaches us:
1. that no strength of attachment to Jesus can justify such confident promises of fidelity, made without dependence on him.
2. that all promises to adhere to him should be made relying on him for aid.
3. that we little know how feeble we are until we are tried.
4. that Christians may be left to great and disgraceful sins to show them their weakness.
Luke adds that Jesus said to Peter that Satan had desired to have him, that he might sift him as wheat - that is, that he might thoroughly test him. But Jesus says that he had prayed for him that his faith should not fail, and charged him when he was "converted" - that is, when he was "turned" from this sin - to strengthen his brethren; to wit, by teaching them to take warning by his example. See the notes at Luke 22:31-33.

Peter - said unto him, Though all men shall be offended - yet will I never - The presumptuous person imagines he can do every thing, and can do nothing: thinks he can excel all, and excels in nothing: promises every thing, and performs nothing. The humble man acts a quite contrary part. There is nothing we know so little of as ourselves - nothing we see less of than our own weakness and poverty. The strength of pride is only for a moment. Peter, though vainly confident, was certainly sincere - he had never been put to a sore trial, and did not know his own strength. Had this resolution of his been formed in the strength of God, he would have been enabled to maintain it against earth and hell. This most awful denial of Christ, and his abandoning him in the time of trial, was sufficient to have disqualified him for ever from being, in any sense, head of the Church, had such a supremacy been ever designed him. Such a supremacy was never given him by Christ; but the fable of it is in the Church of Rome, and the mock Peter, not Peter the apostle, is there and there only to be found.

Peter answered and said unto him,.... Who was always a forward man, free to speak his mind, and was often the mouth of the rest; observing what Christ had affirmed concerning all of them, that that very night, in a very short space of time, they would be offended because of him; and knowing the strong love he had for Christ, and being persuaded it could never be his case, thus addresses him,
though all men shall be offended because of thee, yet will I never be offended: his sense is, that though all the men in the world, friends, and foes, though even all the rest of the disciples, who were his most intimate friends, most closely attached to him, and who dearly loved him, and sincerely believed in him, should be so stumbled at what should befall him, as to flee from him, and be tempted to relinquish his cause, and interest; yet nothing should ever cause him, in the least, to stumble and fall, to desert him, or hesitate about him, or cause him to take the least umbrage and offence at what might come upon him; and this he was positive of would be the case, not only that night, but ever after. No doubt he said this in the sincerity of his heart, and out of his great fervour of affection for Christ; but what he failed in, was trusting to his own strength, being self-confident; and in entertaining greater opinion of himself, and his steady attachment to Christ, than of the rest of the disciples; and in contradicting what Christ had so strongly affirmed of them all, without any exception, and so of himself, and had confirmed by so glaring a prophecy concerning this matter.

Peter answered. With his usual rashness.