The following is Matthew Henry’s commentary in regard to Ephesians 4:18,19
The more general exhortation to purity and holiness of heart and life. It begins thus, “That you henceforth walk not as other Gentiles walk, that for the time to come you do not live, and behave yourselves, as ignorant and unconverted heathens do, who are wholly guided by an understanding employed about vain things, their idols and their worldly possessions, things which are no way profitable to their souls, and which will deceive their expectations” Converted Gentiles must not live as unconverted Gentiles do. Though they live among them, they must not live like them.
Gross and affected ignorance is destructive to religion and godliness. And what was the cause of their being thus ignorant? It was because of the blindness or the hardness of their heart. It was not because God did not make himself known to them by his works, but because they would not admit the instructive rays of the divine light. They were ignorant because they would be so. Their ignorance proceeded from their obstinacy and the hardness of their hearts, their resisting the light and rejecting all the means of illumination and knowledge.
The ways of sin were too pleasurable, convenient, accessible, and in many ways rewarding to the flesh and its urgings, life became uncomplicated leisurable. Psalm 106:35 -39 But were mingled among the heathen, and learned their works. 106:36 And they served their idols: which were a snare unto them. 106:37 Yea, they sacrificed their sons and their daughters unto devils, 106:38 And shed innocent blood, even the blood of their sons and of their daughters, whom they sacrificed unto the idols of Canaan: and the land was polluted with blood. 106:39 Thus were they defiled with their own works, and went a whoring with their own inventions.
“Father in Heaven, I place your children before your throne, knowing Father there is nothing hidden from you. I am appealing to you, Lord, that all hidden secrets in our hearts be revealed through you, for their acceptance and correction by your servants. Praying Father, for deep discernment, to be placed in our souls. Bring an understanding of your works now and in the future. Save us, O LORD our God, and gather us from among the heathen, to give thanks unto your holy name, and to triumph in your praise. Blessed be the LORD God of Israel from everlasting to everlasting: and let all the people say, Amen. Praise all of you the LORD. This I pray in your name Yeshua, Amen, and Amen.”
Phillipians 4:8-9 Finally, brethren, whatsoever things are true, whatsoever things are honest, whatsoever things are just , whatsoever things are pure, whatsoever things are lovely, whatsoever things are of good report; if there be any virtue, and if there be any praise, think on these things. 4:9 Those things, which all of you have both learned, and received, and heard, and seen in me, do: and the God of peace shall be with you.
Robert a humble obedient servant of Yeshua and his Father in heaven YA.