The Meaning of Holy: Qadosh and Hagios
The Hebrew word qadosh and its Greek equivalent hagios both carry the root meaning of "set apart" or "separate"." To be holy is first and foremost to be distinct -- not ordinary, not common, not belonging to the everyday realm. God himself is described as holy above all else: Isaiah's vision of the seraphim crying "Holy, holy, holy is the LORD of hosts" (Isaiah 6:3) uses the threefold repetition that is the Hebrew superlative -- God is holy to the uttermost degree. His holiness encompasses both his moral perfection (absolute purity, without any shadow of evil) and his ontological transcendence (he is categorically other than creation). When God declares his people holy, he is doing two things simultaneously: describing what he has already made them through redemption (positional sanctification), and indicating what he is making them by his Spirit (progressive sanctification). The call 'Be holy, for I am holy" (Leviticus 11:44; 1 Peter 1:16) is therefore both indicative and imperative -- both a statement of identity and a call to action. You are holy; therefore, be holy.
Three Dimensions of Sanctification: Positional, Progressive, and Final
New Testament theology distinguishes three aspects of sanctification that must be held together. Positional sanctification (also called definitive sanctification) refers to the once-for-all act by which God sets believers apart at the moment of conversion. 'You were washed, you were sanctified, you were justified in the name of the Lord Jesus Christ「 (1 Corinthians 6:11) -- all past tense, completed actions. Hebrews 10:10 states: 」We have been made holy through the sacrifice of the body of Jesus Christ once for all'.' Every believer, regardless of spiritual maturity, is positionally sanctified -- fully and completely set apart in Christ. Progressive sanctification refers to the ongoing transformation of the believer into the likeness of Christ across their lifetime. 「We all... are being transformed into the same image from one degree of glory to another」 (2 Corinthians 3:18) -- present tense, ongoing. Final sanctification (glorification) is the completion of the process at death or resurrection, when the believer is freed from the very presence of sin and conformed perfectly to the image of Christ (1 John 3:2; Romans 8:29-30). Confusing these three aspects leads to distorted Christian living: those who ignore progressive sanctification become complacent; those who ignore positional sanctification never find rest.
The Role of the Holy Spirit in Sanctification
Sanctification is the particular work of the Holy Spirit, which is why he is called the Holy Spirit. 'God chose you... through the sanctifying work of the Spirit「 (2 Thessalonians 2:13). The Spirit's sanctifying work operates through several means. Through the Word: "Sanctify them by the truth; your word is truth」 (John 17:17) -- Scripture is the primary instrument by which the Spirit renews the mind (Romans 12:2) and produces the fruit of holiness. Through prayer and worship: as believers behold God's glory, they are transformed (2 Corinthians 3:18). Through community: the body of Christ, with its gifts of teaching, encouragement, accountability, and correction, is the context in which sanctification is worked out (Ephesians 4:11-16). Through suffering: Romans 5:3-5 describes how suffering produces perseverance, character, and hope -- the Spirit uses affliction to burn away what is not of Christ. The Spirit's work is not coercive but cooperative: "Work out your salvation with fear and trembling, for it is God who works in you' (Philippians 2:12-13). Human effort and divine empowerment are not competitors -- they operate simultaneously at different levels.
Sanctification and the Law: Freedom, Not Legalism
One of the most important and misunderstood aspects of sanctification is its relationship to the law. Legalism says: obey the rules to earn God's favor. Antinomianism says: since we are under grace, rules don't apply. Both are distortions. The New Testament teaches a third way: the law's moral content expresses the character of God himself. The Holy Spirit writes this law on the heart (Jeremiah 31:33; Ezekiel 36:26-27; Romans 8:4), so that sanctified believers fulfill the law not by external coercion but by internal transformation. The fruit of the Spirit (Galatians 5:22-23) -- love, joy, peace, patience, kindness, goodness, faithfulness, gentleness, self-control -- is precisely the character that the law pointed toward but could not produce by itself. Paul declares: "Against such things there is no law" (Galatians 5:23). The truly sanctified person does not obey because they must; they obey because their desires have been reoriented toward God and his ways.
Practical Means of Sanctification: Habits That Cooperate with Grace
Because sanctification is cooperative -- God's work and our work simultaneously -- believers are called to actively pursue holiness through specific practices. Hebrews 12:14 commands: "Make every effort to live in peace with everyone and to be holy; without holiness no one will see the Lord"." The classic Puritan tradition called these practices "means of grace" -- channels through which grace flows. Regular, meditative reading of Scripture (Psalm 119:9,11) exposes the mind to the renewing word of God. Prayer -- especially honest confession, thanksgiving, and intercession -- keeps the relationship with God alive and dependent. Corporate worship and the Lord's Supper rehearse the gospel that is the foundation of sanctification. Accountability in a community of believers creates conditions for honest self-examination and mutual encouragement (Hebrews 10:24-25). Fasting trains the body to submit to the spirit. John Owen's summary remains the clearest: "Be killing sin or sin will be killing you"." Sanctification requires both mortification of specific sins and active cultivation of their opposite virtues.