20 The Arabic word Rabb, usually translated Lord, has also the meaning of cherishing, sustaining, bringing to maturity. Allah cares for all the worlds He has created (see n. 1787 and n. 4355). There are many worlds - astronomical and physical worlds, worlds of thought, spiritual world, and so on. In every one of them, Allah is all-in-all. We express only one aspect of it when we say: "In Him we live, and move, and have our being." The mystical division between (1) Nasut, the human world knowable by the senses, (2) Malakut, the invisible world of angels, and (3) Lahut, the divine world of Reality, requires a whole volume to explain it.