Eph 4:17-24, 17 This I say, therefore, and testify in the Lord, that you should no longer walk as the rest of the Gentiles walk, in the futility of their mind, …
Paul’s amdomnishes believers to no longer be children in understanding, growth and how we handle the things of God. In vs 17-22, he cautions believers to no longer walk in unbiblical practices that would have been associated with the gentiles but walk in the new calling.
He gives the following marks to keep in mind, #1. Do not have your minds and understanding darkened (vs 18). This is Satan’s work to block and darken the mind, (2Co 4:4) #2. Do not be alienated from the life of God (vs 18), that is being aliens from the worship, rites (ceremonies) and privileges of Christians. #3. Do not be ignorant (vs 18), ignorance opens doors to anything in the name of God (vs 18). #4. Do not be blind in the heart; that is the enemy of faith, (2Co 3:14). #5. Do not go back to the past life to give self over to lewdness (vs 19).
Paul says in vs 20-21, “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”. In summary, that is not the way of Christ if you were taught the right way to imitate Christ. His antidote falls back on vs 1 “…walk worthy of the calling with which you were called” by first putting off your old self (vs 22) and “and to put on the new self, created after the likeness of God in true righteousness and holiness.” (vs 24).