Charles Spurgeon Commentary John 21:18

"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." — John 21:18 (ASV)

Truly, truly, I say to you, When you were young, you girded yourself, and walked where you wished; but when you shall be old, you shall stretch forth your hands, and another shall gird you, and carry you where you do not wish to go.

Peter, you will have to be girded with an iron chain, and taken off to prison, and taken off to the cross to die.