In Quod Apostolici Muneris (1878), Pope Leo XIII deplores those who “under the motley and all but barbarous terms and titles of Socialists, Communists, and Nihilists, are spread abroad throughout the world,” striving in alliance for “the purpose long resolved upon, of uprooting the foundations of civil society at large.” It may sound odd to our ears, that socialists, whose prescriptions for society are many and comprehensive, should be united with nihilists, who by definition believe in nothing. But Pope Leo, beginning as always from a rich view of human nature grounded in reason and elevated by relevation, sees the alliance we miss—and by implication he includes as well the fellow traveler, secular liberalism, friendlier to the free market but ultimately also an enemy to man.
How so? In this essay I will focus on two of the evils Leo discusses in his letter. The first is the denial of the body; the second, the severance of human law from divine law, effacing in citizens the sense of moral obligation. We obey such human laws because it is to our advantage, narrowly and materially conceived, to do so, not because it is right and just.