Here is a biblical definition of sanctification: the process of being set apart for God’s special purpose and transformed into the likeness of Jesus Christ. It involves both an initial, instant setting apart at conversion and a progressive, lifelong work of the Holy Spirit to free believers from the power of sin and develop personal holiness.
The Fact of the Hidden Life Colossians 3:3 declares the fact: “For you have died, and your life is hidden with Christ in God.” Scripture makes it clear what our born-again spiritual state with regard to the world and sin is: “you have died.” It is obvious that we are alive as mortal beings — that we are alive physically. Thus, the reference to death refers to our spiritual death to the old way of life we lived in the world before accepting Christ.
This dual activity of sanctification links our new position in life to our new, empowered experience—Christ imparting a new way of thinking for actualization through our doing. Paul reveals that the gospel, through the Spirit, has transformative power to lead Christians on the path to eternal life. There is both death to the old life and an animating power of new life—a disciplined cessation of the old ways, conjoined with the Spirit energizing new life, transforming the heart and mind anew.
As we will see, this study of sanctification focuses on Paul’s letter to the Colossians, chapter 3. This reveals our experience of unity with Christ through his Spirit, as he imparts his holiness to us. Here, Paul makes it clear that the reality of death to sin is our decisive rejection of sin, empowered by the animating new spiritual life in the Lord’s Spirit.
Living the New Life. The following text emphasizes our contemplative thinking with our doing: “Since you have been raised to new life with Christ, set your sights on the realities of heaven, where Christ sits in the place of honour at God’s right hand. Think about the things of heaven, not the things of earth. For you died to this life, and your real life is hidden with Christ in God. And when Christ, who is your life, is revealed to the whole world, you will share in all his glory.” (Colossians 3: 3-4 NLT)
Dying to the Old Life. Here, our responsibility in this new life is seen in active unity with the Spirit: “So put to death the sinful, earthly things lurking within you. Have nothing to do with sexual immorality, impurity, lust, and evil desires. Don’t be greedy, for a greedy person is an idolater, worshiping the things of this world. Because of these sins, the anger of God is coming. You used to do these things when your life was still part of this world. But now is the time to get rid of anger, rage, malicious behaviour, slander, and dirty language. Don’t lie to each other, for you have stripped off your old sinful nature and all its wicked deeds.” (Colossians 3: 4-5 NLT)
You are a Representative Messenger of Christ. “It is important to allow Christ to do his mighty work of love in you as you are bought with a price: Let the message about Christ, in all its richness, fill your lives. Teach and counsel each other with all the wisdom he gives. Sing psalms and hymns and spiritual songs to God with thankful hearts. And whatever you do or say, do it as a representative of the Lord Jesus, giving thanks through him to God the Father.” (Colossians 3: 6-7 NLT)
Living the New Life Hidden with Christ. Here we see that our spiritual renewal is enabled by our agreement to “clothe yourselves with love” as Christ’s transformative love works within our hearts: “Put on your new nature, and be renewed as you learn to know your Creator and become like him. In this new life, it doesn’t matter if you are a Jew or a Gentile, circumcised or uncircumcised, barbaric, uncivilized, slave, or free. Christ is all that matters, and he lives in all of us. Since God chose you to be the holy people he loves, you must clothe yourselves with tenderhearted mercy, kindness, humility, gentleness, and patience. Make allowance for each other’s faults, and forgive anyone who offends you. Remember, the Lord forgave you, so you must forgive others. Above all, clothe yourselves with love, which binds us all together in perfect harmony. And let the peace that comes from Christ rule in your hearts. For as members of one body, you are called to live in peace. And always be thankful.” (Colossians 3: 10-15 NLT)
Our New Life is Hidden with Christ. Though we have died spiritually, our renewed life is hidden in the Spirit realm, protected by Christ when we remain dependent on Him. An abiding union with His death — crucifying the old man, so to speak, always includes a union with the powers of His resurrection and life. (John 15:4-5; Galatians 2.20)
The following is a quote from a book I cite below:
Christ Himself in His discourse on the Mount admonished each of us to lay up treasures in heaven and not on earth because ‘where your treasure is, there will your heart be also’ (Matt. 6:19–21). There is no treasure more valuable than Jesus, the pearl of great price. Nothing else approaches His infinite value and intrinsic worth. To regard Him so is to have our earthly heart fixed where He is and where we are in union with Him. 1
1 Beeke, Joel R., and Michael P. V. Barrett. 2021. A Radical, Comprehensive Call to Holiness. Christian Focus.