While I still quibble at a few points, Budziszewski's A Case for Natural Law is very readable and offers many good critiques of inadequate theories. I am still not convinced at his conclusion/proposal, but it was worth the read.

I wonder if Van Drunen's larger work on Two Kingdoms is the Natural Law book in question.

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J. B. Atken
John Knox PCA
Layman, M.A. student at Louisiana College