 Olivi accepts a doctrine that is known as “universal hylomorphism”, i.e. the view that every substance, except God, is composed of form and matter. The hylomorphic scheme as such is of course taken from Aristotle, but the idea that it must be applied also to spiritual entities, such as the human soul and angels, is an extension that was popularized by Dominicus Gundissalinus. The philosophical reason behind this view is related to the idea that forms are fully actual. Everything that can undergo a change from one state to another requires potentiality, and thus all created substances must have a material constituent (Summa II q. 16, p. 304). In particular, Olivi holds that although the human soul is a spiritual entity, it is not a pure form but a hylomorphic combination of form and what Olivi calls “spiritual matter” (for details and qualifications, see  § 2.3  below). Thus, Olivi, following Bonaventure, divides matter into two radically different kinds: corporeal and spiritual. All physical things around us are composed of corporeal matter and a form that actualizes and organizes it. The metaphysical structure of spiritual substances (angels and intellectual souls) is similar but the matter that enters their metaphysical composition is of a different kind. (Ribordy 2010; Suarez-Nani 2009, 29–44)