 Hobbes at one point rules a good deal of religious discussion out of philosophy, because its topics are not susceptible to the full detailed causal explanation that is required for scientia, the best sort of knowledge. “Thus philosophy excludes from itself theology, as I call the doctrine about the nature and attributes of the eternal, ungenerable, and incomprehensible God, and in whom no composition and no division can be established and no generation can be understood” (Hobbes 1655, 1.8). Also excluded are discussion of angels, of revelation, and of the proper worship of God. But despite these not being, strictly speaking, philosophy, Hobbes does in fact have a good deal to say about them, most notably in Leviathan. Things outside philosophy (in its strict sense) may not be amenable to thorough causal explanation in terms of the motions of bodies, but they may well still be within the limits of rational discussion.