Intrinsic and Instrumental Goods

Romans 6:12 Let not sin therefore reign in your mortal body, to make you obey its passions. 13 Do not present your members to sin as instruments for unrighteousness, but present yourselves to God as those who have been brought from death to life, and your members to God as instruments for righteousness. 14 For sin will have no dominion over you, since you are not under law but under grace.
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I recently had the opportunity to hear Professor Robert George of Princeton University give an address entitled, "Natural Law, Human Rights and God". One of the things he asserted was that any serious discussion of natural law needed to be predicated on an acceptance of certain intrinsic goods. Things like friendship or free will are certainly instrumental to achieve something, but they are also good in and of themselves. Without finding intrinsic goodness in an array of things, one has a very difficult time asserting natural law exists. In the passage above Paul describes our bodies as being instrumental either for death or life. I think he would probably agree that the human being, as a creation of God, has a certain intrinsic goodness in it - in the sense that we are "fearfully and wonderfully made" but that we are also instrumental for something, either good or evil. It seems that our free will allows us to become more or less intrinsically good by choosing to be instrumental to the Great Intrinsic Good. In as much as we are instrumental to righteousness, we are filled with the goodness of God and sanctified.