Romans 12:2

To continue the study of Romans let's take a look at verse 2 : And do not be conformed to this world, but be transformed, by the renewing of your mind, that you may prove what is that good and acceptable and perfect will of God.
"Be transformed," notice how it does not say transform yourself. The way this verse is written indicates surrendering to the transformation more than doing the transformation. The same is true earlier in that verse where it says not to BE conformed to this world. The verse presents the idea that you will be subservient to either the world, or to God. You must make a choice which power you yield to and allow to control your life. You might argue that you could deny control to either, but unforunately to choose neither is impossible, to deceive yourself into believing that you are fully and soley in control of your life is in fact conforming to this world, using the wisdom of this world.
Secondly I notice the phrase, "that you may prove, what is that good and acceptable and perfect will of God. Our lives are to be proof of God's will. We are to be an exhibit of the greatness of God, in all aspects of our lives.