 The theories are standardly divided on a metaphysical basis, that is, in terms of which kinds of properties are held to constitute the meaning. Supernaturalist theories are views according to which a spiritual realm is central to meaning in life. Most Western philosophers have conceived of the spiritual in terms of God or a soul as commonly understood in the Abrahamic faiths (but see Mulgan 2015 for discussion of meaning in the context of a God uninterested in us). In contrast, naturalist theories are views that the physical world as known particularly well by the scientific method is central to life’s meaning.