In The Nature of True Virtue, one of the most powerful treatises on social ethics ever written. Jonathan Edwards lays out how sin destroys the social fabric. He argues that human society is deeply fragmented when anything but God is our highest love. If our highest goal in life is the good of our family, then, says Edwards, we will tend to care less for other families. If our highest goal is the good of our nation, tribe, or race, then we will tend to be racist or nationalistic. If our ultimate goal in life is our own individual happiness, then we will put our own economic and power interests ahead of others. Edwards concludes that only if God is our summum bonum, our ultimate good and life center, will we find our heart drawn out not only to people of all families, races, and classes, but to the whole world in general. - Tim Keller.