18 Verily, verily, I say unto thee, When thou wast young, thou girdedst thyself, and walkedst whither thou wouldest: but when thou shalt be old, thou shalt stretch forth thy hands, and another shall gird thee, and carry thee whither thou wouldest not. 19 This spake he, signifying by what death he should glorify God. And when he had spoken this, he saith unto him, Follow me. (John 21:18-19 KJV)
William Burkitt’s Commentary
In these words our Saviour forewarns Peter of his future sufferings, intimating, that he should prove more stout than in his former trial. When he was young and unexperienced, he enjoyed his liberty; but when he was grown older in years and stronger in grace, he should willingly stretch forth his hands, and quietly suffer himself to be bound to the cross; for Peter (say some) was not nailed, but tied and bound to the cross only, and so as a martyr or witness for the truth of Christ glorified God by his death.
Learn hence, 1. The ministers of Jesus Christ, when they undertake the charge of his flock, must prepare for suffering work, and their lot upon it: therefore is this prediction of Peter’s suffering joined with the former injunction, Feed my sheep.
2. That human nature in Christ’s ministers, as well as in any other men, reluctates sufferings, has an antipathy against a violent death: they shall carry thee whither thou wouldest not.
3. From the time of St. Peter’s sufferings, when he is old; learn, that the timing of the saints’ sufferings is in Christ’s hands; he can, and when he pleaseth doth, screen them from suffering till old age; and when their work is almost done for God, they close their days with suffering for him: When thou art old, thou shalt stretch forth thine hands, and another shall gird thee.
Learn lastly, that the suffering of the saints in general, and of the ministers of Christ in particular, do redound much to the glory of God; which is a consideration that ought to reconcile them to the cross of Christ, and support them under it: This spake he, signifying by what death he should glorify God.