*17 Now this I say and testify in the Lord, that you must no longer walk as the Gentiles do, in the futility of their minds. 18 They are darkened in their understanding, alienated from the life of God because of the ignorance that is in them, due to their hardness of heart. 19 They have become callous and have given themselves up to sensuality, greedy to practice every kind of impurity. 20 But that is not the way you learned Christ!— 21 assuming that you have heard about him and were taught in him, as the truth is in Jesus, 22 to put off your old self, which belongs to your former manner of life and is corrupt through deceitful desires, 23 and to be renewed in the spirit of your minds, 24 and to put on the new self, created after the likeness of God in true righteousness and holiness.
**1 Corinthians 1:26-31 **
*26 For consider your calling, brothers: not many of you were wise according to worldly standards, not many were powerful, not many were of noble birth. 27 But God chose what is foolish in the world to shame the wise; God chose what is weak in the world to shame the strong; 28 God chose what is low and despised in the world, even things that are not, to bring to nothing things that are, 29 so that no human being might boast in the presence of God. 30 And because of him you are in Christ Jesus, who became to us wisdom from God, righteousness and sanctification and redemption, 31 so that, as it is written, “Let the one who boasts, boast in the Lord.”
To put off the old self is to strip away, as in taking off old, filthy clothes, which is the worn out, useless, and unconverted sinful nature corrupted by deceit. . This describes repentance from sin and submission to God at the point of salvation. Reference Colossians 3:3-9; Isaiah 55:6-7; Matthew 19:16-22; Acts 2:38-40, 2:21; 1 Thessalonians 1:9). Salvation is a spiritual union with Jesus Christ that is described as the death plus burial of the old self and the resurrection of the new self walking in newness of life. This transformation is Paul’s theme in Romans 6.
Salvation involves the mind (Romans 12:2; 2 Corinthians 10:5), which is the center of thought, understanding, and belief, as well as of motive and action (Colossians 3:1-2, 10). When a person becomes a Christian, God gives the person a completely new spiritual and moral capability that a mind apart from Christ could never achieve (1 Corinthians 2:9-16). The renewal of the mind in salvation brings not simply a renovation of character, but transformation of the old to the new self (2 Corinthians 5:17). In Christ, the old self no longer exists as it had in the past; the new self is created in the very likeness of God (Galatians 2:20).
The redeemed not only are given salvation by God’s wisdom rather than their own, but are also graciously given a measure of God’s divine wisdom, as well as imputed righteousness (Romans 4:5; 2 Corinthians 5:21, sanctification from sin (Ephesians 2:10), and redemption by God (Ephesians 1:14; 1 Peter 1:18-19) in order that above all else, the Lord will be glorified (Galatians 6:4).