Paul talked about being transformed into the image of Christ in the context of the New Covenant that Jesus established before he was crucified (Matthew 26:26-29, 2 Corinthians 3:5). The Greek word metamorphoo (met-am-or-foˊ-o) is “spoken figuratively of our being transformed in mind and heart” (G3339) in 2 Corinthians 3:18 where it says, “And we with unveiled face, beholding the glory of the Lord, are being transformed into the same image from one degree of glory to another. For this comes from the Lord who is the Spirit.” Paul used the example of Christ’s humility to encourage the Philippians to willingly engage in the process of transformation that Christians are called to. Paul told the Philippian believers to “have this mind among yourselves, which is yours in Christ Jesus, who though he was in the form of God, did not count equality with God a thing to be grasped, but emptied himself, by taking the form of a servant, being born in the likeness of men. And being found in human form, he humbled himself by becoming obedient to the point of death, even death on a cross” (Philippians 2:5-7).

Paul explained in his letter to the Colossians that being alive in Christ involves putting off the body of the flesh (Colossians 2:11). What Paul meant by this was that believers should not be controlled by their desires. Paul said in his letter to the Ephesians that this kind of lifestyle belongs to a believer’s former manner of life and is corrupt through deceitful desires (Ephesians 4:22). Paul told the Colossians:

But now you must put them all away: anger, wrath, malice, slander, and obscene talk from your mouth. Do not lie to one another, seeing that you have put off the old self with its practices and have put on the new self, which is being renewed in knowledge after the image of its creator. (Colossians 3:8-10)

Paul said that a believer must put off their old self and put on the new self, indicating that an intentional effort is required. Regeneration or spiritual rebirth has two different aspects. The new birth or what Jesus referred to as being born again (John 3:3) “stresses the communication of spiritual life in contrast to antecedent spiritual death …it is the act by which God brings him from death to life. In the act itself (rather than the preparation for it), the recipient is passive, just as a child has nothing to do with his own birth.” Regeneration stresses the inception of a new state of things in contrast with the old. This ongoing process, known as the renewal of the mind or anakainosis (an-ak-ah’ee-no-sis), “by contrast, is the gradual conforming of the person to the new spiritual world in which he now lives, the restoration of the divine image. In this process the person is not passive but is a fellow worker with God” (G3824).

The renewal of the mind or the act of putting off the old self and putting on the new self is also referred to as the walk of repentance because it involves an ongoing, continuous cycle of repenting from sin. The renewing of our minds is a result of us continually adjusting our thinking to align with God’s word. Paul indicated in his letter to Titus that renewing believers’ minds is a work of the Holy Spirit. Jesus told his followers, “Nevertheless, I tell you the truth: it is to your advantage that I go away, for if I do not go away, the Helper will not come to you. But if I go, I will send him to you. And when he comes, he will convict the world concerning sin and righteousness and judgment: concerning sin, because they do not believe in me; concerning righteousness because I go to the Father, and you will see me no longer; concerning judgment because the ruler of this world is judged. I still have many things to say to you, but you cannot bear them now. When the Spirit of truth comes, he will guide you into all the truth, for he will not speak on his own authority, but whatever he hears he will speak, and he will declare to you the things that are to come” (John 16:7-15). Jesus told his disciples the Holy Spirit would convict the world concerning sin because they do not believe in him. The Greek word that is translated convict, elegcho (el-engˊ-kho) means “to prove one in the wrong and thus to shame him” (G1651).

Paul indicated in his letter to the Colossians that the old self is associated with practices, performing something repeatedly or “habitually” (G4238). Putting on the new self involves believers replacing these sinful habits with godly behavior. Paul instructed the Colossians:

Put on then, as God’s chosen ones, holy and beloved, compassionate hearts, kindness, humility, meekness, and patience, bearing with one another and, if one has a complaint against another, forgiving each other; as the Lord has forgiven you, so you also must forgive. And above all these put on love, which binds everything together in perfect harmony. And let the peace of Christ rule in your hearts, to which indeed you were called in one body. And be thankful. (Colossians 3:12-15)

The behaviors that Paul identified are referred to as the fruit of the Spirit in Galatians 5:22-23. Paul said if we live by the Spirit, we should keep in step with the Spirit (Galatians 5:25). In other words, our walk of repentance should not be hindered by an unwillingness on our part to repent of the sins that the Holy Spirit makes us aware of.

Paul made it clear in his letter to the Ephesians that renewal, or more specifically change, takes place in the mind. Paul said in Ephesians 5:23 that we are to be renewed in the spirit of our minds. The spirit is “the principle of life residing in man. The breath breathed by God into man and again returning to God, the spiritual entity in man (Matthew 27:50; Luke 8:55; 23:46; John 19:30; Acts 7:59; 1 Corinthians 15:45; Revelation 13:15)” (G4151). The mind is described in the Bible “as the seat of emotions and affections, mode of thinking and feeling, disposition, moral inclination, equivalent to the heart (Romans 1:28; 12:2; 1 Corinthians 1:10; Ephesians 4:17, 23; Colossians 2:18; 1 Timothy 6:5; 2 Timothy 3:8; Titus 1:15)” (G3563). To be renewed in the spirit of your mind, you have to change the way you think. Believers must intentionally stop thinking about certain things and in certain ways and intentionally start thinking about life the way that God does. Paul said, “you must put them all away: anger, wrath, malice, slander, and obscene talk from your mouth” (Colossians 3:8), and then, “put on…kindness, humility, meekness, and patience” (Colossians 3:12).

Paul indicated the way to put off and put on is by letting the word of Christ dwell in us (Colossians 3:16). “The expression ‘the word [logos, (3056)] of Christ’ refers to the revelation that Jesus Christ brought into the world” (note on Colossians 3:16). Logos means “the Divine Expression” (G3056). It says in Hebrews 1:3 that Jesus is the exact imprint of God’s nature, “and he upholds the universe by the word of his power.” The Greek word that is translated word in this verse is rhema (hrayˊ-mah). Jesus used the word rhema when he responded to the devil’s temptation to command the stones to become loaves of bread. Jesus stated, “Man shall not live by bread alone, but by every word that comes from the mouth of God” (Matthew 4:4), indicating that when we put on or take in God’s word, we are receiving the spiritual nourishment that enables us to live forever (G2198).