And I ask not for these only. He now gives a wider range to his prayer, which hitherto had included the apostles alone; for he extends it to all the disciples of the Gospel, so long as there shall be any of them to the end of the world. This is assuredly a remarkable ground of confidence; for if we believe in Christ through the doctrine of the Gospel, we ought to entertain no doubt that we are already gathered with the apostles into his faithful protection, so that not one of us shall perish. This prayer of Christ is a safe harbour, and whoever retreats into it is safe from all danger of shipwreck; for it is as if Christ had solemnly sworn that he will devote his care and diligence to our salvation. He began with his apostles, that their salvation, which we know to be certain, might make us more certain of our own salvation; and, therefore, whenever Satan attacks us, let us learn to meet him with this shield, that it is not to no purpose that the Son of God united us with the apostles, so that the salvation of all was bound up, as it were, in the same bundle. There is nothing, therefore that ought more powerfully to excite us to embrace the Gospel; for as it is an inestimable blessing that we are presented to God by the hand of Christ to be preserved from destruction, so we ought justly to love it, and to care for it above all things else. In this respect the madness of the world is monstrous. All desire salvation; Christ instructs us in a way of obtaining it, from which if any one turn aside, there remains for him no good hope; and yet scarcely one person in a hundred deigns to receive what was so graciously offered. For those who shall believe on me, We must attend to this form of expression. Christ prays for all who shall believe in him. By these words he reminds us of what we have sometimes said already, that our faith ought to be directed to him. The clause which immediately follows, through their word, expresses admirably the power and nature of faith, and at the same time is a familiar confirmation to us who know that our faith is founded on the Gospel taught by the apostles. Let the world then condemn us a thousand times, this alone ought to satisfy us, that Christ acknowledges us to be his heritage and pleads with the Father for us. But woe to the Papists, whose faith is so far removed from this rule, that they are not ashamed to vomit out this horrid blasphemy, that there is nothing in Scripture but what is ambiguous, and may be turned in a variety of ways. The tradition of the Church is therefore their only authoritative guide to what they shall believe. But let us remember that the Son of God, who alone is competent to judge, does not approve of any other faith [1] than that which is drawn from the doctrine of the apostles, and sure information of that doctrine will be found no where else than in their writings. We must also observe that form of expression, to believe through the word, which means that faith springs from hearing, because the outward preaching of men is the instrument by which God draws us to faith. It follows, that God is, strictly speaking, the Author of faith, and men are the ministers by whom we believe, as Paul teaches (1-Corinthians 3:5.)

Footnotes

1 - "Qui seul en peut et doit prononcer, n'approve point d'autre foy."

Neither pray I for these alone - Not for the apostles only, but for all who shall be converted under the preaching of the gospel. They will all need similar grace and be exposed to similar trials. It is a matter of unspeakable joy that each Christian, however humble or unknown to men however poor, unlearned, or despised, can reflect that he was remembered in prayer by "him whom God heareth always." We value the prayers of pious friends. How much more should we value this petition of the Son of God! To that single prayer we who are Christians owe infinitely more real benefits than the world can ever bestow; and in the midst of any trials we may remember that the Son of God prayed for us, and that the prayer was assuredly heard, and will be answered in reference to all who truly believe.
All may be one - May be united as brethren. Christians are all redeemed by the same blood, and are going to the same heaven. They have the same wants, the same enemies, the same joys. Though they are divided into different denominations, yet they will meet at last in the same homes of glory. Hence they should feel that they belong to the same family, and are children of the same God and Father. There are no ties so tender as those which bind us in the gospel. There is no friendship so pure and enduring as that which results from having the same attachment to the Lord Jesus. Hence, Christians, in the New Testament, are represented as being indissolubly united - parts of the same body, and members of the same family, Acts 4:32-35; 1Co. 12:4-31; Ephesians 2:20-22; Romans 12:5. On the ground of this union they are exhorted to love one another, to bear one another's burdens, and to study the things that make for peace, and things wherewith one may edify another, Ephesians 4:3; Romans 12:5-16.
As thou, Father, art in me - See John 14:10. This does not affirm that the union between Christians should be in all respects like that between the Father and the Son, but only in the points in which they are capable of being compared. It is not the union of nature which is referred to, but the union of plan, of counsel, of purpose seeking the same objects, and manifesting attachment to the same things, and a desire to promote the same ends.
That they also may be one in us - To be in God and in Christ is to be united to God and Christ. The expression is common in the New Testament. The phrase used here denotes a union among all Christians founded on and resulting from a union to the same God and Saviour.
That the world may believe - That the world, so full of animosities and fightings, may see the power of Christian principle in overcoming the sources of contention and producing love, and may thus see that a religion that could produce this must be from heaven. See the notes at John 13:34. This was done. Such was the attachment of the early Christians to each other, that a pagan was constrained to say, "See how these Christians love one another!"

III. Our Lord's Prayer for His Church, and for All Who Would Believe on His Name, Through the Preaching of the Apostles and Their Successor. John 17:20-26. See on John 17:1 (note).
Neither pray I for these alone - This prayer extends itself through all ages, and takes in every soul that believes in the Lord Jesus.
And what is it that Christ asks in behalf of his followers? The greatest of blessings: unity, peace, love, and eternal glory.

(6) Neither pray I for these alone, but for them also which shall believe on me through their word;
(6) Secondly, he offers to God the Father all of his, that is, all those who will believe in him by the doctrine of the apostles: that as he cleaves unto the Father, receiving from him all fulness, so they being joined with him may receive life from him, and being loved together in him, may also with him eventually enjoy everlasting glory.

Neither pray I for these alone,.... Meaning his immediate apostles and disciples, for whose preservation and sanctification he had been particularly praying in John 17:19; and now, that it might not be thought that these were his only favourites, and the only persons he had a regard for, and to whom his intercession and sacrifice were confined; he adds,
but for them also which shall believe in me through their word: Christ is the object of true faith; which faith is not a mere assent of the mind to any truth concerning Christ, as that he is the Son of God, the Messiah and Saviour of the world; but it is a spiritual sight of him, of the necessity, fitness, and suitableness of him as a Saviour, a going forth unto him, laying hold on him, and depending upon him for life and salvation; of which the preaching of the Gospel is the instrumental means: it is indeed a gift of God, and a fruit of electing grace, and which is secured by it; hence our Lord knew that there would be a number, in all successive generations, that would believe in him, through the ministry of the word; and for these persons, and their conversion, and the success of the Gospel, to the good of their souls, he prays.

Our Lord especially prayed, that all believers might be as one body under one head, animated by one soul, by their union with Christ and the Father in him, through the Holy Spirit dwelling in them. The more they dispute about lesser things, the more they throw doubts upon Christianity. Let us endeavour to keep the unity of the Spirit in the bond of peace, praying that all believers may be more and more united in one mind and one judgment. Thus shall we convince the world of the truth and excellence of our religion, and find more sweet communion with God and his saints.

Neither pray I for these alone--This very important explanation, uttered in condescension to the hearers and readers of this prayer in all time, is meant not merely of what follows, but of the whole prayer.
them also which shall believe--The majority of the best manuscripts read "which believe," all future time being viewed as present, while the present is viewed as past and gone.

Neither pray I for these alone. We enter upon the third section of the prayer, that for all disciples in every age.

For them who will believe - In all ages.