But influence goes both ways, and evangelicals may have something to offer the natural law thinkers as well. Specifically, the evangelical emphasis on the brokenness of our rational faculties because of sin may serve as a reminder that truthful accounts of the goods of traditional marriage are not enough for moral or social transformation—those interested in preserving traditional marriage need beauty as well, beauty that comes in the form of lives and marriages that reflect the beauty of the cross.
Albert Mohler, president of the Southern Baptist Theological Seminary, was hinting at something along these lines when he remarked at the end of a recent conversation with Robert George: "I'm thankful that he's making [these arguments] better than just about anyone else is making them. And as an evangelical, we have every reason to use natural law arguments; we just don't believe that in the end they're going to be enough."
Matthew Lee Anderson is the Founder and Lead Writer of Mere Orthodoxy. He is the author of Earthen Vessels: Why Our Bodies Matter to our Faith and The End of Our Exploring: A Book about Questioning and the Confidence of Faith. Follow him on Twitter or on Facebook.