"And be not conformed to this world: but be ye transformed by the renewing of your mind, that ye may prove what is that good, and acceptable, and perfect, will of God." Romans 12:2
"Be not conformed to this world". What does it mean and how are we conformed to the world? It means your way of thinking. Your thinking forms your attitude and behavior. Before you came to Christ and were born again, you had a worldly mindset-- you were conformed to the world. Now that you have received Jesus Christ as Savior and follow Him as Lord, you have to develop a Godly/Kingdom mindset. You have to take on the "mind of Christ". In short, your thinking has to be like His, which in turn will transform your life.
How do we stop being conformed to the world and its way of thinking, its behavior, its attitude? By renewing our minds with God's Word. His Word lets us know what is good in the sight of God, what is acceptable to Him and what His will is concerning our attitude.
The world's way of thinking is contrary to God's ways. The world says do unto others the way they have done unto you. God's way of thinking says to do to others the way you want them to do to you. The world says hold on to grudges. God says to forgive. The world seeks vengeance for wrongs done. God says that vengeance belongs to Him. The world says hate wins. God says love wins. The world says flaunt and demand your rights. God says deny yourself.
The Bible says that before we came to Christ we were not only living in darkness but we were darkness-- our hearts, souls, spirits and minds were darkened by our fallen, evil, sinful nature and way of thinking. But now that we are children of light and are the light of the world, we have to change our way of thinking so that our behavior will line up with who we are-- children of God. And that through our right thinking, attitude and behavior, the world will see Christ in us and desire to have Him in their lives as well. "For you were once darkness, but now are you light in the Lord: walk as children of light." (Ephesians 5:8)
Have a great day. Before Jesus came into your life, you were in the world--- you thought like and acted like the world. Now, you have to keep your mind renewed and think and act like Him.