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He was interested mainly in the problem of evil, modernism in Roman Catholic Church, ideology of Romanticism, and crisis of European culture, in which he indicated fascism and communism as a dangerous.
Polymath Gottfried Wilhelm Leibniz and poet Alexander Pope were both famous for developing a system of thought known as philosophical optimism in an attempt to reconcile a loving Christian God with the logical problem of evil (made evident in disasters such as Lisbon).
Davis’s students have honored him with two festschrifts, Moral Problems in American Life (1998), edited by Karen Halttunen and Lewis Perry, and The Problem of Evil: Slavery, Freedom, and the Ambiguities of Reform (2007), edited by Steven Mintz and John Stauffer.