Saint Paul starts by exhorting us to present our bodies as a living sacrifice, holy and acceptable to God, as an act of homage justly owed to him. He tells us not to conform ourselves to the world but to be transformed by renewing our will and our thinking: seeking to find out the will of God, to discover what is good, what is acceptable, what is perfect; for we ourselves are the whole of that sacrifice.
–Saint Augustine (354-430)