This I say therefore, and testify in the Lord, that ye henceforth walk not as other Gentiles walk, in the vanity of their mind, Having the understanding darkened, being alienated from the life of God through the ignorance that is in them, because of the blindness of their heart: Who being past feeling have given themselves over unto lasciviousness, to work all uncleanness with greediness. Ephesians 4:17-19

When you become Born Again in Christ, you are transformed, you are a new creature (2 Cor. 5:17) the old man is dead and you are a new creation (Romans 6:6) This is what the Apostle Paul is talking about here “Testify in The Lord, that you don’t walk as other Gentiles walk” You shouldn’t be the same person you were before you were saved. There should be an evidence of change, you should be producing spiritual fruit by the Holy Spirit (Matthew 7, Galatians 5)

Why doesn’t everyone understand the gospel of Jesus Christ? As Paul says here “Having the understanding darkened, being alienated from the life of God through ignorance” Some people can’t understand the gospel because they are spiritually dead, they are dead in their sins, dead in their relationship with God, dead in their soul. They have no understanding of the spiritual world, this is why Jesus said “Unless you become Born Again, you can’t see the Kingdom of God” (John 3:3)

A spiritual dead person can’t enter the Kingdom of God, it doesn’t matter how religious they are , how many books they read, they need to get baptized by the Holy Spirit. (John 3) They need to be transformed into a new creation. They are like the Dry Bones in the valley of Ezekiel, and they need the Breath of God to revive them back to life (Ezekiel 37)

But ye have not so learned Christ; If so be that ye have heard him, and have been taught by him, as the truth is in Jesus: That ye put off concerning the former conversation the old man, which is corrupt according to the deceitful lusts; And be renewed in the spirit of your mind;And that ye put on the new man, which after God is created in righteousness and true holiness. Ephesians 4:20-24

As the Apostle Paul says “You put off the old man, the former way of life” You are no longer the same person you were before you came to Christ. And be renewed in the spirit of your mind. As a Born Again believer, you will be filled and sealed by the Holy Spirit. There will be a transformation, and you will produce fruits of righteousness

Put on the New Self, no longer are we dead in our sins, no longer are we separated from God, we are Born Again through Jesus Christ our Lord, Amen!