 Presumably Fârâbî thinks that Aristotle drew these conclusions on the basis of his analyses of the senses of being and unity, of the ways in which one kind of being [mawjûd] could be prior to another being, of what a being’s existence [wujûd] is, of how one being can cause existence to another being, and so on. Fârâbî himself undertakes such analyses in his Book of Letters and On the One, and in one section of the Book of Letters he sketches in a purely hypothetical way how they might lead to a first being that is being in the strongest sense.