 Declaring that moral evil is rooted in the will does not fully explain it. We would need a further account of how evil choices are made—of what sort of moral psychology could explain them. For Kant, explanation ceases at some point; evil choices, at bottom, are irrational—surds that we can identify and impute, but never fully explain. “There is no conceivable ground for us, therefore, from which moral evil could first have come in us” (Kant 1793 [AK 6:43; 1998: 64]).