To conclude this series, let’s recap what is meant by natural law by parsing the term.
The “nature” referred to in natural law can mean different things, but I mean by it the divinely engrafted knowledge of morality in human reason and conscience, that which all human beings share by virtue of their creation in God’s image. Theologically speaking, I think this understanding of nature points back to our original creation in God’s image, but it also anticipates the fall into sin, where the divine image was corrupted but not destroyed.
“Law,” too, can vary in meaning, but we have used it here as shorthand for the universal moral law written into the human heart by God. Law as a representation of God’s will can be known through a variety of means such as the Ten Commandments, the Torah, the Sermon on the Mount, the pangs of conscience, or the rational intuition of good and evil. When “nature” and “law” are understood in these ways, the claim that natural law is a forgotten legacy of the Reformation is certainly an understatement.
Natural law holds great promise as a bridge to connect the Christian faith to culture, although from the fuller perspective of God’s revelation in Jesus Christ, natural law has limited but significant value. Natural law is not merely the quest for order on the part of the state and non-Christians as Karl Barth held, it is also a profound source of truth revealed to every person — according to their capacities — through creation, conscience, and reason. When natural law is understood properly, only so much should be expected from it as a source of revelation. God does not save the world through natural law, nor does he reconcile the world through the pursuit of justice; but he does provide a public record of his eternal power and divinity through the law written on the heart.
This has been cross-posted to my blog on natural law, Common Notions.