31 Jesus therefore said to those Jews who had believed him, "If you remain in my word, then you are truly my disciples.
*Minor differences ignored. Grouped by changes, with first version listed as example.
If you continue in my word. Here Christ warns them, in the first place, that it is not enough for any one to have begun well, if their progress to the end do not correspond to it; and for this reason he exhorts to perseverance in the faith those who have tasted of his doctrine. When he says that they who are firmly rooted in his word, so as to continue in him, will truly be his disciples, he means that many profess to be disciples who yet are not so in reality, and have no right to be accounted such. He distinguishes his followers from hypocrites by this mark, that they who falsely boasted of faith give way as soon as they have entered into the course, or at least in the middle of it; but believers persevere constantly to the end. If, therefore, we wish that Christ should reckon us to be his disciples, we must endeavor to persevere.
If ye continue in my word - If you continue to obey my commandments and to receive my doctrines.
Then are ye - This is the true test of Christian character. John 14:21; "he that hath my commandments and keepeth them, he it is that loveth me." See John 2:4; John 3:24; 2-John 1:6. In this place Jesus cautions them against too much confidence from their present feelings. They were just converted - converted by a single sermon. They had had no time to test their faith. Jesus assures them that if their faith should abide the test, if it should produce obedience to his commandments and a truly life, it would be proof that their faith was genuine, for the tree is known by its fruit. So we may say to all new converts, Do not repress your love or your joy, but do not be too confident. Your faith has not yet been tried, and if it does not produce a holy life it is vain, James 2:17-26.
If ye continue in my word - Or, in this doctrine of mine. It is not enough to receive God's truth - we must retain and walk in it. And it is only when we receive the truth, love it, keep it, and walk in it, that we are the genuine disciples of Christ.
(12) Then said Jesus to those Jews which believed on him, If ye continue in my word, [then] are ye my disciples indeed;
(12) The true disciples of Christ continue in his doctrine, that profiting more and more in the knowledge of the truth they may be delivered from the most grievous burden of sin, into the true liberty of righteousness and life.
Then said Jesus to those Jews that believed on him,.... For he knew instantly who they were, and when they believed on him; and therefore he immediately turned himself to them, and thus addressed them;
if ye continue in my word; meaning the Gospel, called his, because he was both the author, and preacher, and sum, and substance of it: and to continue in it, is having cordially received it, to abide by it, and hold it fast, and not to be moved from it, by the temptations of Satan; the cunning of those that lie in wait to deceive; nor by the revilings and persecutions, the frowns and flatteries of men: and when men continue thus steadfast in it, and faithful to it, it is an evidence that it has come with power, and has a place in their hearts, and that they are the true followers of Christ:
then are ye my disciples indeed; there are two sorts of disciples of Christ; some are only nominal, and merely in profession such; and these sometimes draw back from him, discontinue in his word, and go out from among his people; which shows that they never were of them, nor are the true disciples of Jesus; for the genuine disciples of Christ continue in his Gospel, hold fast to him, the head, and remain with his people; which to do to the end, is an evidence, of their being disciples indeed.
Then said Jesus to those Jews who believed, If ye continue in my word, then are ye my disciples indeed, &c.--The impression produced by the last words of our Lord may have become visible by some decisive movement, and here He takes advantage of it to press on them "continuance" in the faith, since then only were they His real disciples (compare John 15:3-8), and then should they experimentally "know the truth," and "by the truth be made (spiritually) free."
If ye continue in my word, then ye are my disciples indeed. They "believed on him," but their faith was not yet made perfect by obedience. Hence he adds the condition of discipleship. Their belief must move them to accept his word and obey it. There is a condition, continue in my word; a promise, shall be my disciples.
*More commentary available at chapter level.