Romans 12:2 = “Stop conforming to the pattern of this world, but be transformed by the renewing of your mind. Then you will be able to test and approve what God’s Will is—his good, pleasing and perfect Will.”
When we accept Jesus Christ, His Holy Spirit transforms us from the inside-out, sometimes starting with the mind. When this happens, you no longer WANT to do as you did before, but now want to live for God. So let Him renew your mind, and follow it up with your actions. How? Stop becoming like the world (again) and give yourself completely to Christ.
I recently heard a marriage counselor on the radio who said that one of the biggest causes of broken marriages is self-centeredness…when one or each of the couple says, “This is who I am, I won’t change.” They became 2 at marriage, but when they prevent such transformation, they’re actually separating themselves from the union, thus trying to return to the one individual…as it was before they were married. And this destroys their marriage.
It’s the same when it comes to conversion from the world to Christ. When we choose with our minds not to allow the transformation from sin to holiness, from the world to Christ, we’re actually preventing ourselves from knowing God, from following Him and even begin to fall away from Him. We hang onto what we’ve known and who we were before accepting Christ, which is the exact opposite of what we did when we denied ourselves and chose to follow Him in the first place.