Commentaries:
Barnes' Notes
That thy faith fail not - The word "faith," here, seems to be used in the sense of religion, or attachment to Christ, and the words "fail not" mean "utterly fail" or fail altogether - that is, apostatize. It is true that the "courage" of Peter failed; it is true that he had not that immediate confidence in Jesus and reliance on him which he had before had; but the prayer of Jesus was that he might not altogether apostatize from the faith. God heard Jesus "always" John 11:42; it follows, therefore, that every prayer which he ever offered was answered; and it follows, as he asked here for a specific thing, that that thing was granted; and as he prayed that Peter' s faith might not utterly fail, so it follows that there was no time in which Peter was not really a pious man. Far as he wandered, and grievously as he sinned, yet he well knew that Jesus was the Messiah. He "did know" the man; and though his fears overcame him and led him to aggravated sin, yet the prayer of Christ was prevalent, and he was brought to true repentance.
When thou art converted - The word "converted" means turned, changed, recovered. The meaning is, when thou art turned from this sin, when thou art recovered from this heinous offence, then use "your" experience to warn and strengthen those who are in danger of like sins. A man may be "converted or turned" from any sin, or any evil course. He is "regenerated" but once - at the beginning of his Christian life; he may be "converted" as often as he falls into sin.
Strengthen thy brethren - Confirm them, warn them, encourage them. They are in continual danger, also, of sinning. Use your experience to warn them of their danger, and to comfort and sustain them in their temptations. And from this we learn:
1.That one design of permitting Christians to fall into sin is to show their own weakness and dependence on God; and,
2.That they who have been overtaken in this manner should make use of their experience to warn and preserve others from the same path.
The two epistles of Peter, and his whole life, show that "he" was attentive to this command of Jesus; and in his death he manifested his deep abhorrence of this act of dreadful guilt in denying his blessed Lord, by requesting to be crucified with his head downward, as unworthy to suffer in the same manner that Christ did. Compare the notes at John 21:18.
Other Barnes' Notes entries containing Luke 22:32:
Psalms 51:13
Matthew 18:1-6
Matthew 26:75
Mark 16:1-8
Mark 16:1-8
James 5:19
1 Peter 5:10
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