 Aquinas, Thomas |  Darwinism |  Kant, Immanuel: and Hume on morality |  Kant, Immanuel: philosophy of religion |  -->Mackie, John Leslie--> |  metaethics |  Mill, John Stuart |  moral anti-realism |  moral epistemology |  moral non-naturalism |  moral realism |  naturalism: moral |  Nietzsche, Friedrich |  Platonism: in metaphysics |  pragmatic arguments and belief in God |  religious experience |  Sidgwick, Henry |  voluntarism, theological 