  The aitiological argument is “more certain,” because it begins with a real effect outside the mind and therefore better fits Aristotle’s model of demonstration. But Bonaventure does not follow Aristotle’s argument from motion, because motion falls under the categories. More promising were neoplatonic aitiological arguments (Boethius Consolatio philosophiae III 10; Anselm, Monologion 1–3), which combine an empirical premise with a participation premise. This is how Bonaventure packed his aitiological argument into a single syllogism: “Every truth and every created nature proves and leads to the existence of the divine truth. For if there is being by participation and from another, there must exist a being due to its own essence and not from  another.”[49]