John 17:17 · Bible study
John 17:17 Commentary: Sanctify Them in Truth
Greek · 11 what the commentators say
Meaning in one sentence
Jesus prays for disciples' sanctification through truth. Explore the meaning of 'sanctify,' the role of God's word, and what this means for believers.
Research Summary
- Meaning: Jesus prays for his disciples to be consecrated and made holy through their immersion in God’s truth, which is his word.
- Key words: Hagiazō (sanctify, consecrate, purify); alētheia (truth, reality); logos (word, revelation, the whole gospel).
- Main debate: Whether “sanctify” here primarily means consecration to ministry or progressive personal holiness, most commentators affirm both.
- Theological theme: Sanctification as the work of God through the truth of Scripture, in union with Christ the High Priest.
- Best use: Doctrinal teaching on sanctification, pastoral prayer, and encouragement for believers to love and trust God’s word.
Translation Comparison
BSB Berean Standard Bible 2020
Sanctify them by the truth; Your word is truth.
WEB World English Bible 2000
Sanctify them in your truth. Your word is truth.
KJV King James Version 1769
Sanctify them through thy truth: thy word is truth.
ASV American Standard Version 1901
Sanctify them in the truth: thy word is truth.
YLT Young's Literal Translation 1898
sanctify them in Thy truth, Thy word is truth;
Darby Darby Bible 1890
Sanctify them by the truth: thy word is truth.
Douay-Rheims Douay-Rheims Bible 1899
Sanctify them in truth. Thy word is truth.
Translations in other languages (10 available)
Santifícalos|strong="G0037, G0846" en tu verdad: tu palabra es verdad.
Santifica-os em tua verdade; tua palavra é a verdade.
Sanctifie-les par ta vérité: ta parole est la vérité.
Heilige sie in deiner Wahrheit; dein Wort ist die Wahrheit.
Heilig ze in Uw waarheid; Uw woord is de waarheid.
Santificali nella verità: la tua parola è verità.
Poświęć je w prawdzie twojej; słowo twoje jest prawdą.
Освяти их истиною Твоею; слово Твое есть истина.
求你用 真理 使他們 成聖；你 的道 就是 真理。
Make them holy by the true word: your word is the true word.
Verse in Context
Original Language (Koine Greek)
New Testament · Koine Greek · John 17:17
Source: STEPBible TAGNT/TEHB (CC-BY 4.0). Click or tap a morphology code to see the full parsing.
Scholars' Consensus
Commentators across the spectrum agree that Jesus’ prayer for sanctification carries two overlapping meanings. The Greek verb hagiazō can mean both “to consecrate, set apart for sacred use” and “to purify, make holy.” Adam Clarke, Albert Barnes, and John Gill each note that here Jesus likely intends both: the disciples are being set apart for their apostolic mission and also being progressively made holy in character. John Calvin emphasizes consecration to God, calling it “the kingdom of God and his righteousness.” Yet he insists that the means of sanctification is the truth of the Word, against any “fanatics” who would seek holiness apart from Scripture.
There is also broad agreement that “truth” (Greek alētheia) is not merely a set of correct doctrines but the sphere or element in which sanctification happens. The best Greek manuscripts read “in the truth,” as the Cambridge Bible and Vincent’s Word Studies note, not “through your truth.” This is not an abstract concept: the truth is the revealed word of God, the gospel. The second half of the verse grounds the first: “Your word is truth.” The Word is both the standard and the instrument by which God makes his people holy.
How settled is the interpretation?
Interpretive difficulty: Medium
Main views:
- Consecration to ministry: The Old Testament background of sanctifying priests (Exodus 29), the immediate context of commissioning the apostles (v.18), and the parallel with Jesus sanctifying himself (v.19) support a primary meaning of setting apart for service. Calvin and Wesley are representative.
- Progressive personal holiness: The prayer asks for growth in holiness (Barnes, Matthew Henry). The request is for those already disciples but not yet perfect, and the means (truth) suggests ongoing transformation. Gill calls sanctification 'a progressive work.'
- Both (positional and progressive): Most commentators (Clarke, Barnes, Gill, Matthew Henry) explicitly say Jesus includes both meanings. The word ἁγιάζω carries both senses, and the immediate need of the disciples (sent into the world, needing purity and mission) demands both.
What is clear: Jesus prays that his disciples be sanctified—consecrated and made holy—by means of the truth, which is the word of God.
What Scholars Agree and Debate
| Topic | Agreed | Debated |
|---|---|---|
| Meaning of 'sanctify' (ἁγιάζω) | All commentators agree the word can mean both 'set apart for sacred use' and 'make holy.' The context of the prayer includes both the disciples’ mission and their moral transformation. | Some, like Calvin and Wesley, lean toward consecration to office. Others, like Barnes and Matthew Henry, lean toward progressive personal holiness. Most see the two as inseparable. |
| Text: 'your truth' vs. 'the truth' | The meaning is essentially the same: the truth belongs to God. The variant does not change the theology. | The best manuscripts (P66, Sinaiticus, Vaticanus) omit σου ('your'), but many translations include it based on later manuscripts. The Cambridge Bible and Vincent prefer the shorter reading. |
| Role of the Word in sanctification | The Word (logos) is the truth by which believers are sanctified. It is the revelation from God, the gospel. | Calvin warns against fanatics who seek sanctification apart from the Word. Others, like Barnes, include all truth (providence, creation) as means, but all emphasize the priority of Scripture. |
| Scope of the prayer: for apostles only or all believers? | The immediate context is the apostles, but verse 20 extends it to all who believe through their word. | Some traditions emphasize the prayer as a model for ordained ministry (Catholic, Orthodox), while others apply it directly to every Christian’s sanctification. |
Historical & Cultural Context
John 17:17 sits within what is often called Jesus’ high priestly prayer, spoken on the night of his arrest. The entire chapter echoes the Old Testament ritual of the Day of Atonement, when the high priest entered the Holy of Holies to intercede for Israel. Here Jesus, the true high priest, lifts his eyes to heaven and prays for his disciples. The word “sanctify” (hagiazō) was used in the Greek Old Testament (the Septuagint) for the consecration of priests, the tabernacle, and its furnishings (Exodus 29:1, 36; 40:13). Adam Clarke and others point out that Jesus is acting in reference to the high priest’s duty to sanctify the sons of Aaron.
But this is not merely a ritual act. Jesus is about to leave his disciples in a hostile world (John 17:14, 16). They are “not of the world,” yet they are being sent into it as his ambassadors (v.18). To survive, and to fulfill their mission, they need more than protection. They need to be internally transformed and visibly set apart. The prayer for sanctification is the positive counterpart to the negative prayer for protection from the evil one.
The phrase “your word is truth” draws on a deep Old Testament stream. The psalmist declares, “Yahweh’s words are flawless words, as silver refined in a clay furnace” (Psalms 12:6). “Yahweh’s law is perfect, restoring the soul” (Psalm 19:7). “How can a young man keep his way pure? By living according to your word” (Psalm 119:9). Jesus identifies the word he has spoken, the gospel, with this same purifying, life-giving truth of God. The disciples are to be sanctified not by escaping the world but by being immersed in the truth that comes from the Father.
Textual Notes
The phrase “your truth” (τῇ ἀληθείᾳ σου) appears in many manuscripts, but the pronoun σου is absent from the earliest and best witnesses, including Papyrus 66, Codex Sinaiticus, and Codex Vaticanus. The Cambridge Bible notes that “thy” is “a gloss, rightly explaining the text, but wanting in all the best MSS.” Most modern translations, like the RSV and NIV, read “sanctify them in the truth.” The meaning is not materially affected, since the context clearly identifies the truth as God’s. No other significant textual variants affect this verse.
Reception History
From the early church onward, John 17:17 has been treasured as part of Christ’s “prayer of consecration.” Chrysostom, quoted in Lange’s commentary, saw the entire chapter as teaching believers to turn to God in tribulation, with Jesus modeling intent prayer by lifting his eyes to heaven. During the Reformation, Calvin used the verse to argue that sanctification is inseparable from the Word, rejecting any mystical holiness that bypasses Scripture. The Anglican scholar B. F. Westcott (in the Cambridge Bible) highlighted the phrase “in the truth,” calling it the new environment of believers. In Methodist tradition, Wesley and Clarke stressed the progressive nature of holiness and the Word’s role in it. The verse has been widely used in ordination services and in discussions on the authority of Scripture, as it anchors both ministry and personal purity in the truth of God.
Preaching This Verse
Three-point outline
- Jesus Prays for Sanctification. He asks the Father to “sanctify” his disciples. This includes both their consecration to God’s service and their moral purification. The prayer shows that sanctification is not something we achieve alone, it is a gift sought from the Father.
- Sanctification Happens “in the Truth.” The Greek preposition en means “in,” marking truth as the environment or sphere of transformation. To be sanctified is to live and breathe in the reality of God’s revelation.
- That Truth Is God’s Word. Jesus grounds everything in a bedrock claim: “Your word is truth.” The Word of God, the gospel, is the fixed, reliable instrument of sanctification.
Five-point outline
- Jesus Our High Priest Intercedes. He prays for his disciples, modeling the priestly work he will complete on the cross.
- Sanctification Is a Double Gift. It is being set apart for God and being made holy, both positional and progressive.
- The Sphere Is Truth. Christians are not sanctified by ritual or effort alone but by being placed “in” the truth of Christ.
- The Word Is That Truth. Scripture is not merely true, it is truth itself, the standard and source of holiness.
- This Prayer Is for Us Too. In John 17:20, Jesus says he prays for “those who will believe in me through their word.” Every believer is included.
Illustration hooks
- A garden transplant: a wild plant taken and set into cultivated soil. The plant does not change itself, the new environment transforms it. So the truth of God’s word is the new soil in which believers grow.
- A compass and a map: truth shows where north is; the Word gives the route. Sanctification is not wandering but walking a revealed path.
Questions your congregation is asking
- “Does sanctification mean I have to be perfect before God will use me?”
- “How does simply reading the Bible make me more holy?”
- “Is this prayer for the apostles only, or for me too?”
Leading a Discussion
This verse is a window into Jesus’ own heart for his followers. As he faces the cross, he prays not for their success but for their holiness, and he ties that holiness directly to the truth of God’s word. In a world that often pressures us to blend in, this prayer invites us to consider what it means to be set apart and made clean by the truth.
Discussion questions
- What does the word “sanctify” mean in this verse? List the different ways you hear it used in the commentaries.
- Why do you think Jesus prays for sanctification right after asking for protection from the evil one?
- What is the difference between being sanctified “through” the truth and “in” the truth? Does the wording change how you understand the process?
- Jesus says “Your word is truth.” How does that statement connect to the prayer for sanctification? What else does the Bible call truth?
- How has God’s word functioned as a sanctifying force in your own life? Share a specific example if you can.
- This prayer was originally for the apostles, but Jesus extends it to all believers in verse 20. What does it mean for you to know that Jesus prayed for your holiness?
- Sanctification is both a gift to receive and a path to walk. Which side of that do you find easier, and which harder?
Word Study
The key original-language words in this verse. Select any word for its full lexicon entry — meaning, every occurrence in Scripture, and related words.
Cross-References
Source: Treasury of Scripture Knowledge (TSK, public domain)
| II Samuel 7:28 | “Now, O Lord Yahweh, you are God, and your words are truth, and you have promised this good thing to your servant. |
| Psalms 12:6 | Yahweh’s words are flawless words, as silver refined in a clay furnace, purified seven times. |
| Psalms 19:7 | Yahweh’s law is perfect, restoring the soul. Yahweh’s covenant is sure, making wise the simple. |
| Psalms 19:9 | The fear of Yahweh is clean, enduring forever. Yahweh’s ordinances are true, and righteous altogether. |
| Psalms 119:9 | How can a young man keep his way pure? By living according to your word. |
| Psalms 119:11 | I have hidden your word in my heart, that I might not sin against you. |
| Psalms 119:104 | Through your precepts, I get understanding; therefore I hate every false way. NUN |
| Psalms 119:144 | Your testimonies are righteous forever. Give me understanding, that I may live. QOPH |
Interlinear and lexical data from STEPBible (CC BY 4.0). Cross-reference data from OpenBible.info (CC BY 4.0). Commentaries are public domain.
For personal reflection
Read the devotional page — prayer, application, and "for families"
What the Commentators Say
10 public-domain commentaries, condensed into plain language.
Adam Clarke's Commentary Methodist/Wesleyan 1826
Clarke notes that sanctify carries a double meaning: to consecrate or separate from earthly concerns, and to make holy. He applies both to ministers, who must be fully set apart for God's work and personally holy. Truth is the only foundation for this consecration and for any preaching that truly saves souls.
Barnes' Notes on the Bible Protestant 1832
Barnes sees sanctification as both growing personal holiness and being set apart for God's service. He stresses that this happens through truth, which he defines as seeing things as they actually are—God, ourselves, life, death, and eternity. All of God's Word, works, and providence present this true picture and thereby purify the soul.
Calvin's Commentaries Reformed 1564
Calvin stresses that sanctification comes only through God's truth, and that truth is specifically the Word of God. He warns against those who seek holiness apart from Scripture or who speak of truth while ignoring the Word itself. The Gospel is the appointed means by which God consecrates His people.
Geneva Bible Notes Reformed 1599
Sanctifie them with thy trueth: thy word is trueth.
Gill's Exposition of the Bible Baptist 1748
Gill emphasizes that sanctification is an ongoing, gradual work, not completed in this life. Even the most mature believers continue growing from spiritual infancy toward maturity. This progress is carried forward through the truth of the Gospel, which both begins and advances sanctification in God's people.
Jamieson-Fausset-Brown Commentary Protestant 1871
JFB draws a sharp distinction between the two parts of Jesus' prayer: the first asks protection from the world's corrupting influence, while the second positively asks for the progress and completion of the disciples' sanctification. This sanctification comes through God's revealed truth, which is His word.
Lange's Commentary Reformed 1857
Lange emphasizes Christ's prayer as a dynamic concentration of divine power in the disciples, not a scattered blessing on the world. The world is to be overcome and transformed, not directly prayed for, but through the church's preserved unity and holiness acting as a central fire that will eventually cause the world as world to vanish.
Matthew Henry's Commentary Reformed/Presbyterian 1710
Henry sees sanctification as more than protection from evil, an active growth in holiness that Christ prays will be confirmed, carried on, and completed. Even disciples who are already sanctified must keep pressing forward, because failing to advance is falling back. Without this ongoing transformation, Christ cannot own them as his own.
Vincent's Word Studies Evangelical 1887
Vincent focuses on the Septuagint background of the Greek word for sanctify, showing it always meant total dedication or consecration of persons and things to God. He also notes that the best manuscripts read "in the truth" rather than "through thy truth," making the truth the sphere in which believers are consecrated.
Wesley's Explanatory Notes Methodist/Wesleyan 1754
Wesley distinguishes two senses of sanctify. It means both consecrating the disciples to their apostolic office through the Spirit's anointing and perfecting their personal holiness through the power of the word.