Thanks for the ping.
I believe that when God created the universe he included in the mix Natural Law, I believe all codified law comes from Natural law which gives stability to all things.
It is in effect our conscience, which if we let it, will aloow us to do the right thing.
Conscience cannot stand alone, because of original sin people tend towards evil acts, we will mis-use our gift of reason to rationalize and justify evil. A mal-formed conscience is worse than none at all for a man will follow it to Hell and all the while believe he is doing the right thing.
1783 Conscience must be informed and moral judgment enlightened. A well-formed conscience is upright and truthful. It formulates its judgments according to reason, in conformity with the true good willed by the wisdom of the Creator. The education of conscience is indispensable for human beings who are subjected to negative influences and tempted by sin to prefer their own judgment and to reject authoritative teachings.
Right there lies the error of Protestantism