Amplified Bible, Classic Edition
12 I appeal to you therefore, brethren, and beg of you in view of [all] the mercies of God, to make a decisive dedication of your bodies [presenting all your members and faculties] as a living sacrifice, holy (devoted, consecrated) and well pleasing to God, which is your reasonable (rational, intelligent) service and spiritual worship.
2 Do not be conformed to this world (this age), [fashioned after and adapted to its external, superficial customs], but be transformed (changed) by the [entire] renewal of your mind [by its new ideals and its new attitude], so that you may prove [for yourselves] what is the good and acceptable and perfect will of God, even the thing which is good and acceptable and perfect [in His sight for you].
3 For by the grace (unmerited favor of God) given to me I warn everyone among you not to estimate and think of himself more highly than he ought [not to have an exaggerated opinion of his own importance], but to rate his ability with sober judgment, each according to the degree of faith apportioned by God to him.
4 For as in one physical body we have many parts (organs, members) and all of these parts do not have the same function or use,
5 So we, numerous as we are, are one body in Christ (the Messiah) and individually we are parts one of another [mutually dependent on one another].Read full chapter