31 When he had gone out, Jesus said, “Now the Son of Man has been glorified, and God has been glorified in him. 32 If God has been glorified in him, God will also glorify him in himself, and he will glorify him immediately. 33 Little children, I will be with you a little while longer. You will seek me, and as I said to the Jews, ‘Where I am going, you can’t come,’ so now I tell you. 34 A new commandment I give to you, that you love one another, just like I have loved you; that you also love one another. 35 By this everyone will know that you are my disciples, if you have love for one another.”
36 Simon Peter said to him, “Lord, where are you going?”
Jesus answered, “Where I am going, you can’t follow now, but you will follow afterwards.” 37 Peter said to him, “Lord, why can’t I follow you now? I will lay down my life for you.” 38 Jesus answered him, “Will you lay down your life for me? Most certainly I tell you, the rooster won’t crow until you have denied me three times.
Matthew Henry's Commentary on John 13:31-38
Commentary on John 13:31-35
(Read John 13:31-35)
Christ had been glorified in many miracles he wrought, yet he speaks of his being glorified now in his sufferings, as if that were more than all his other glories in his humbled state. Satisfaction was thereby made for the wrong done to God by the sin of man. We cannot now follow our Lord to his heavenly happiness, but if we truly believe in him, we shall follow him hereafter; meanwhile we must wait his time, and do his work. Before Christ left the disciples, he would give them a new commandment. They were to love each other for Christ's sake, and according to his example, seeking what might benefit others, and promoting the cause of the gospel, as one body, animated by one soul. But this commandment still appears new to many professors. Men in general notice any of Christ's words rather than these. By this it appears, that if the followers of Christ do not show love one to another, they give cause to suspect their sincerity.
Commentary on John 13:36-38
(Read John 13:36-38)
What Christ had said concerning brotherly love, Peter overlooked, but spoke of that about which Christ kept them ignorant. It is common to be more eager to know about secret things, which belong to God only, than about things revealed, which belong to us and our children; to be more desirous to have our curiosity gratified, than our consciences directed; to know what is done in heaven, than what we may do to get thither. How soon discourse as to what is plain and edifying is dropped, while a doubtful dispute runs on into endless strife of words! We are apt to take it amiss to be told we cannot do this and the other, whereas, without Christ we can do nothing. Christ knows us better than we know ourselves, and has many ways of discovering those to themselves, whom he loves, and he will hide pride from them. May we endeavour to keep the unity of the Spirit in the bond of peace, to love one another with a pure heart fervently, and to walk humbly with our God.