17 So I tell you this, and insist on it in the Lord, that you must no longer live as the Gentiles do, in the futility of their thinking. 18 They are darkened in their understanding and separated from the life of God because of the ignorance that is in them due to the hardening of their hearts. 19 Having lost all sensitivity, they have given themselves over to sensuality so as to indulge in every kind of impurity, and they are full of greed.
Those who are unbelievers can be so callous and hard that they are "past feeling". They live by their feelings in unbridled sensuality and carnality. Such people are past doing what they should be doing with their feelings. God gives people feelings for a specific purpose and use in their walk with Him. But people who have alienated themselves from God are hardened to the place where they are beyond using their feelings for the right purpose. Satan moves them into an area where they live riotous lives, doing whatever they feel like doing.
20 That, however, is not the way of life you learned 21 when you heard about Christ and were taught in him in accordance with the truth that is in Jesus. 22 You were taught, with regard to your former way of life, to put off your old self, which is being corrupted by its deceitful desires; 23 to be made new in the attitude of your minds;
You and I are not to live that way, but to make the truth of God's Word our standard and to obey it by the power of the Holy Spirit. We are to be constantly renewed in the spirits of our minds, having a fresh mental and spiritual attitude. Attitudes begin in the mind. Our minds are renewed by the Word of God. Reading the Word daily renews our minds and changes our attitudes. Renew your mind in the Word!