To commit Euthyphro's fallacy is to endorse a pair of incompatible explanations, one constitutive and the other causal. Asked to explain the nature of piety, Euthyphro hazards that being pious consists in being an object of the gods' love. But asked what causes the gods to love what they do, he holds with the commonsensical thought that the gods love pious people because they are pious. As Socr...