Matthew Henry Commentary John 13:31-35

"When therefore he was gone out, Jesus saith, Now is the Son of man glorified, and God is glorified in him; and God shall glorify him in himself, and straightway shall he glorify him. Little children, yet a little while I am with you. Ye shall seek me: and as I said unto the Jews, Whither I go, ye cannot come; so now I say unto you. A new commandment I give unto you, that ye love one another; even as I have loved you, that ye also love one another. By this shall all men know that ye are my disciples, if ye have love one to another." — John 13:31-35 (ASV)

Christ had been glorified in many miracles he performed, 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. By this, satisfaction was 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 will follow him in the future; meanwhile, we must wait for his time and do his work. Before Christ left the disciples, he gave 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 professing Christians. People in general notice any of Christ's words rather than these. This shows that if the followers of Christ do not show love to one another, they give cause to suspect their sincerity.