Excerpt: "The standard linage of Augustine and Aquinas that emerges in twentieth-century textbooks of political philosophy is that of two fundamentally opposed theological approaches to the political. Augustine, in one corner, is the clear-eyed realist, convinced that political society is fallen, mired in the consequences of original sin and the contingent necessity to restrain evil, vice, and sin. Aquinas, in the other corner, is the more cheerful Aristotelian, who emphasizes the inherent goodness and naturalness of political society and its beneficial purposes for human flourishing.' These contrasting visions continue to animate diverse Christian understandings of the limits and possibilities of politics."
Gregory, Eric and Clair, Joseph, "Augustinianisms and Thomisms (Chapter Nine of the Cambridge Companion to Political Theology)" (2015). Faculty Publications - College of Christian Studies. 302.