By this shall all men ... - That is, your love for each other shall be so decisive evidence that you are like the Saviour, that all people shall see and know it. It shall be the thing by which you shall be known among all men. You shall not be known by special rites or habits; not by a special form of dress or manner of speech; not by special austerities and unusual customs, like the Pharisees, the Essenes, or the scribes, but by deep, genuine, and tender affection. And it is well known it was this which eminently distinguished the first Christians, and was the subject of remark by the surrounding pagans. "See," said the pagan, "see how they love one another! They are ready to lay down their lives for each other." Alas! how changed is the spirit of the Christian world since then! Perhaps, of all the commands of Jesus, the observance of this is that which is least apparent to a surrounding world. It is not so much that they are divided into different sects, for this may be consistent with love for each other; but it is the want of deep-felt, genuine love toward Christians even of our own denomination; the absence of genuine self-denial; the pride of rank and wealth; and the fact that professed Christians are often known by anything else rather than by true attachment to those who bear the same Christian name and image. The true Christian loves religion wherever it is found equally in a prince or in a slave, in the mansion of wealth or in the cottage of poverty, on the throne or in the hut of want. He overlooks the distinction of sect, of color, and of nations; and wherever he finds a man who bears the Christian name and manifests the Christian spirit, he loves him. And this, more and more as the millennium draws near, will be the special badge of the professed children of God. Christians will love their own denominations less than they love the spirit and temper of the Christian, wherever it may be found.

By this shall all men know, etc. - From this time forward, this mutual and disinterested love shall become the essential and distinctive mark of all my disciples. When they love one another with pure hearts, fervently, even unto death, then shall it fully appear that they are disciples of that person who laid down his life for his sheep, and who became, by dying, a ransom for all.

The disciples of different teachers were known by their habits, or some particular creed or rite, or point of austerity, which they had adopted; but the disciples of Christ were known by this love which they bore to each other. The primitive Christians were particularly known by this among the Gentiles. Tertullian, in his Apology, gives us their very words: Vide, inquiunt, ut se diligunt; et pro alterutro mori parati sunt. "See, said they, how they love one another, and are ready to lay down their lives for each other."

By this shall all men know,.... Not only by this you yourselves will know that ye have passed from death to life, that the true work of grace is begun upon your hearts; nor only by this will you know one another to be Christians; but by this all men, even the men of the world will know,

that ye are my disciples, if ye have love one to another: and own and acknowledge it, as Tertullian (n) says the very Heathens did in his time; who would say, when they saw the Christians pass along the streets, and meet and express their affection to each other, "see how they love one another": would to God the same was as observable now. The distinguishing badge and character of a disciple of Christ, is not any outward garb, or any austerities of life, by which the disciples of John and of the Pharisees were known; nor were the ordinary nor extraordinary gifts of the Spirit, bestowed upon the disciples of Christ, what distinguished them as such; since those who were not truly his disciples, had these bestowed on them; but love to one another, brotherly love was the distinguishing character, and this is another reason or argument enforcing a regard unto it.

(n) Apolog. c. 39.

Shall - know (γνώσονται)

Perceive, or come to know.

My disciples (ἐμοὶ μαθηταί)

See on Matthew 12:49. Literally, disciples unto me. Compare John 15:8.

By this shall all men know that ye are my disciples, if ye have love one to another.

13:35 By this shall all men know that ye are my disciples. The love and self-sacrifice of Christians has done more to extend the name of Christ than argument. In the early ages, heathen were wont to say: See how these Christians love one another.

35. By this shall all men know that ye are my disciples-the disciples of Him who laid down His life for those He loved.

if ye have love one to another-for My sake, and as one in Me; for to such love men outside the circle of believers know right well they are entire strangers. Alas, how little of it there is even within this circle!

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.