The first step involved in being defined by God's culture is to "reckon ourselves dead to sin." The Apostle utilized the Greek word from which we get our English word "logic." This word means "to calculate," or, "to estimate something to be true." It means: What God says to be true in His word is true, thus we choose to live our lives accordingly. So, to "reckon" something is to believe something to be true so much that we make choices in concert with that truth.
When we turn away from sin, we discover that our old habits are deeply engrained in us. In time, we discover that we have the power to say "no" to sin because we have the life of Christ within us. Thinking His thoughts and walking in His ways will always be a struggle this side of heaven, but as we grow in our faith, learning God's faithfulness, we will move forward toward the freedom the Lord Jesus died to grant us.
I think of the Robert the Bruce in the movie, Braveheart who was a "Nobleman." Along with other "Noblemen," Robert the Bruce had made a pact with King Longshanks of England that they would turn a blind eye as the English soldiers would periodically invade Scotland, pillage the land and rape the woman. Just as long as the English would not bother the land or the women of the Noblemen. At the end of the movie, Robert the Bruce, the former coward, had had enough. And in the end of the movie it was Robert the Bruce who turned his back on his cowardice ways and fought for the freedom of Scotland.
The second step involved in this process of our sanctification is in "presenting ourselves to God," which is when we experience intimacy with God. When we trust God, then allow Him to define us by obeying His Word, it will be then that we experience His heart in and through our lives. Since the Lord Jesus died for us, He conquered sin and death. As a result, sin is a dethroned monarch. Even though we know that our sin has been forgiven us, dethroned sin will always try to stake its claim on us. But, we do not have to obey it. When we let God define us, we make choices that are in concert with His word. We choose not to steal because God has told us not to steal, and, we choose to tell the truth because God has told us not to lie.
The believer in Christ is no longer under the Law. Now, we are under God's grace which is the greatest change agent in the world. You see, once we become saturated by God's grace, our hearts are changed so much that we will find that we can't wait to be defined by God; not because we have to but because we want to. The Lord Jesus died so that we could not only be righteous in God's eyes, but also that we might know His life of holiness in and through our lives. The wholeness that His holiness brings to our souls has such an affect on us that we will daily live out of this idea: Less of me and more of Him.