John Gill Commentary John 13:37

"Peter saith unto him, Lord, why cannot I follow thee even now? I will lay down my life for thee." — John 13:37 (ASV)

Peter said to him
Not understanding Christ's answer, and being dissatisfied with it, inquires:

Lord, why cannot I follow you now ?
is the place inaccessible? are the difficulties in the way to it insuperable? the roughness of the road, or the dangers of it, will not discourage me; I am ready to go through the greatest dangers and difficulties, to follow you; yea,

I will lay down my life for your sake ;
whatever enemies I should meet with in, following you, would not dismay me; I would readily hazard my life, and cheerfully lay it down in defence of you.