31 Then when he had gone out, Jesus said, Now is glory given to the Son of man, and God is given glory in him. 32 If God is given glory in him, God will give him glory in himself, and will give him glory even now. 33 My dear children, I am only to be with you a little longer. Then you will be looking for me: and as I said to the Jews, so now I say to you, Where I am going you may not come. 34 I give you a new law: Have love one for another; even as I have had love for you, so are you to have love one for another. 35 By this it will be clear to all men that you are my disciples, if you have love one for another.
36 Simon Peter said to him, Lord, where are you going? Jesus said in answer, Where I am going you may not come with me now, but you will come later. 37 Peter said to him, Why may I not come with you even now? I will give up my life for you. 38 Jesus said in answer, Will you give up your life for me? Truly I say to you, Before the cry of the cock you will have said three times that you are not my disciple.
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.