Sanctify them by thy truth. This sanctification includes the kingdom of God and his righteousness; that is, when God renews us by his Spirit, and confirms in us the grace of renewal, and continues it to the end. He asks, first, therefore, that the Father would sanctify the disciples, or, in other words, that he would consecrate them entirely to himself, and defend them as his sacred inheritance. Next, he points out the means of sanctification, and not without reason; for there are fanatics who indulge in much useless prattle about sanctification, but who neglect the truth of God, by which he consecrates us to himself. Again, as there are others who chatter quite as foolishly about the truth and yet disregard the word, Christ expressly says that the truth, by which God sanctifies his sons, is not to be found any where else than in the word. Thy word is truth; for the word here denotes the doctrine of the Gospel, which the apostles had already heard from the mouth of their Master, and which they were afterwards to preach to others. In this sense Paul says that the Church has been cleansed with the washing of water by the word of life, (Ephesians 5:26 True, it is God alone who sanctifies; but as the Gospel is the power of God to salvation to every one that believeth, (Romans 1:16,) whoever departs from the Gospel as the means must become more and more filthy and polluted. The truth is here taken, by way of eminence, for the light of heavenly wisdom, in which God manifests himself to us, that he may conform us to his image. The outward preaching of the word, it is true, does not of itself accomplish this, For that preaching is wickedly profaned by the reprobate; but let us remember that Christ speaks of the elect whom the Holy Spirit efficaciously regenerates by the word. Now, as the apostles were not altogether destitute of this grace, we ought to infer from Christ's words, that sanctification is not instantly completed in us on the first day, but that we make progress in it through the whole course of our life, till at length God, having taken away from us the garment of the flesh, fills us with his righteousness.

Sanctify them - This word means to render pure, or to cleanse from sins, 1-Thessalonians 5:23; 1-Corinthians 6:11. Sanctification in the heart of a Christian is progressive. It consists in his becoming more like God and less attached to the world; in his getting the ascendency over evil thoughts, and passions, and impure desires; and in his becoming more and more weaned from earthly objects, and attached to those things which are unseen and eternal. The word also means "to consecrate, to set apart to a holy office or purpose." See John 17:19; also the notes at John 10:36. When Jesus prayed here that God would sanctify them, he probably included both these ideas, that they might be made personally more holy, and might be truly consecrated to God as the ministers of his religion. Ministers of the gospel will be really devoted to the service of God just in proportion as they are personally pure.
Through thy truth - Truth is a representation of things as they are. The Saviour prayed that through those just views of God and of themselves they might be made holy. To see things as they are is to see God to be infinitely lovely and pure; his commands to be reasonable and just; heaven to be holy and desirable; his service to be easy, and religion pleasant, and sin odious; to see that life is short, that death is near; that the pride, pomp, pleasures, wealth, and honors of this world are of little value, and that it is of infinite importance to be prepared to enter on the eternal state of being. He that sees all this, or that looks on things as they are, will desire to be holy. He will make it his great object to live near to God and to glorify his name. In the sanctification of the soul God makes use of all truth, or of everything fitted to make a representation of things as they are to the mind. His Word states that and no more; His Spirit and His Providence do it. The earth and the heavens, the seasons, the sunshine and the rain, are all fitted to teach us his goodness and power, and lead us to him. His daily mercies tend to the same end, and afflictions have the same design. Our own sickness teaches us that we are soon to die. The death of a friend teaches us the instability of all earthly comforts, and the necessity of seeking better joys. All these things are fitted to make just representations to the mind, and thus to sanctify the soul. As the Christian is constantly amid these objects, so he should be constantly growing in grace, and daily and hourly gaining new and deeper impressions of the great truths of religion.
Thy word is truth - All that thou hast spoken - that is, all that is contained in the Bible. All the commands and promises of God; His representations of His own character and that of man; His account of the mission and death of His Son; of the grave, the resurrection, judgment, and eternity, all tend to represent things as they are, and are thus fitted to sanctify the soul. We have here also the testimony of the Saviour that the revelation which God has given is true. All that God has spoken is true, and the Christian should rejoice and the sinner should tremble. See Psalm 19:7-14.

Sanctify them - Ἁγιασον, from α, negative, and γη, the earth. This word has two meanings:
1. It signifies to consecrate, to separate from earth and common use, and to devote or dedicate to God and his service.
2. It signifies to make holy or pure. The prayer of Christ may be understood in both these senses. He prayed -
1. That they might be fully consecrated to the work of the ministry, and separated from all worldly concerns.
2. That they might be holy, and patterns of all holiness to those to whom they announced the salvation of God.
A minister who engages himself in worldly concerns is a reproach to the Gospel; and he who is not saved from his own sins can with a bad grace recommend salvation to others.
Through thy truth - It is not only according to the truth of God that ministers are to be set apart to the sacred work; but it is from that truth, and according to it, that they must preach to others. That doctrine which is not drawn from the truth of God can never save souls. God blesses no word but his own; because none is truth, without mixture of error, but that which has proceeded from himself. Our Lord still acts here in reference to the conduct of the high priest, to whom it belonged to sanctify the priests, the sons of Aaron: see on John 17:1 (note).

(f) Sanctify them through thy truth: thy word is truth.
(f) That is, make them holy: and that thing is said to be holy which is dedicated to God and belongs to him alone.

Sanctify them through thy truth,.... The Syriac version introduces this petition, with the appellation "Abba, Father": and the sanctification prayed for regards the apostles, either as ministers of the word, and may intend their separation for their work and office; for which though they were sanctified or separated from their mother's womb, and by Christ when he sent them forth, yet were to have a fresh commission and unction after our Lord's resurrection, and upon his ascension to heaven; and also their qualification for it, with the truth of grace and doctrine, with holiness of heart and life, and with a preservation in the truth, by being kept faithful to it: or it may also regard them as Christians and believers, and intend a greater degree of the sanctification of the Spirit, which is imperfect in this life; for though sanctification in Christ is perfect, and so it is in the saints, as to parts, yet not as to degrees; which appears from the imperfection of faith, hope, love, and knowledge, from indwelling sin, being in the best of saints, from their necessities, from their disclaiming perfection, and their desires after it. Sanctification is a progressive work, which is carried on gradually; as is clear from the characters of regenerate ones, who are first newborn babes, then young men, and afterwards fathers in Christ; from the similes, by which it is expressed as seed which opens and grows up by degrees, and light which shines more and more unto the perfect day from exhortations to a concern for the growth of it, and prayers for it: and it is indeed continually carrying on, as may be concluded from the hand in which it is; and the progress and finishing of this work, as well as the beginning of it, are entirely the Lord's; and the way and means in which this is done, are by or through the truth of the Gospel:
thy word is truth; it is "peculiarly" so, as the Arabic version reads it. The Gospel is here meant, and is so called on account of its original, it comes from the God of truth; and because of the concern which Christ, who is the truth, has in it, he being the author, preacher, and sum and substance of it; and because the Spirit of truth has dictated it, leads into it, qualifies men to preach it, and makes it effectual: and because it contains all truth necessary to salvation, and nothing but truth, and particularly that eminent truth, salvation alone by Christ; and because it is opposed to the law, which is but a shadow, of which the good things in the Gospel are the substance: now this is the means both of the beginning, and increasing, and carrying on the work of sanctification in the hearts of God's people, as well as of an experimental knowledge of it; and an increase of that knowledge does more and more qualify the ministers of it for their ministerial work and service, which seems here chiefly designed.

Christ next prayed for the disciples, that they might not only be kept from evil, but made good. It is the prayer of Jesus for all that are his, that they may be made holy. Even disciples must pray for sanctifying grace. The means of giving this grace is, "through thy truth, thy word is truth." Sanctify them, set them apart for thyself and thy service. Own them in the office; let thy hand go with them. Jesus entirely devoted himself to his undertaking, and all the parts of it, especially the offering up himself without spot unto God, by the eternal Spirit. The real holiness of all true Christians is the fruit of Christ's death, by which the gift of the Holy Ghost was purchased; he gave himself for his church, to sanctify it. If our views have not this effect on us, they are not Divine truth, or we do not receive them by a living and a working faith, but as mere notions.

Sanctify them--As the former prayer, "Keep them," was "negative," asking protection for them from the poisonous element which surrounded and pressed upon their renewed nature, so this prayer, "Sanctify them," is positive, asking the advancement and completion of their begun sanctification.
through--in.
thy truth--God's revealed truth, as the medium or element of sanctification; a statement this of immense importance.
thy word is truth--(Compare John 15:3; Colossians 1:5; Ephesians 1:13).

Sanctify them through thy truth; thy word is truth. To sanctify is to render holy, or to consecrate. Those sanctified are saints. The means of canonization is not a Pope, but the truth; and, lest some should mistake, Christ adds, "Thy word is truth." He prays for their consecration by the power of the word in their hearts. Every disciple should be thus consecrated, but the means is not a miraculous work of grace, but the reception of God's word into our hearts and the complete surrender to his will spoken in his word.

Sanctify - Consecrate them by the anointing of thy Spirit to their office, and perfect them in holiness, by means of thy word.