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Act: has more of the nature of being than potency, 30; nobler than, better than, more intelligible than, truer than potency, 30 Act and potency: abstracted from all matter, 49n.7; and Avicenna’s doctrine of incorruptibility of the soul, 186n.37; not considered by particular sciences, 51n.9; and emergence, 102; more evident as found, respectively, in incorruptible and corruptible substances, 30n.71; intelligibly prior to motion, 53; among the primary differences of being, 53; priority of act over potency, 3–4, 8–9, 30n.71, 79n.64, 224; role of proportion in the grasping of act and potency, 79n.64; and the viewpoint of being, 109 Act of being [esse]: act of the essence, 71, 170n.14, 174; actuality even of the form, 201, 204n.62; actuality of every form or nature, 202n.55; not a bond forging a thing into a unity, 233–34 (against Owens, 229); caused by God through mediation of formal cause, 189; completive of every form, 204; as composite once in Sent., 230; conceived once by Gilson as intrinsic efficient cause, 234n.19; confused knowledge of esse in our knowledge of a being [ens], 44–46, 191; considered through form, 43; not difficult of access, as regards knowing that it is, 191; distinct from operative acts in creatures, 218; esse of creature least of all subsists, is not properly created or annihilated, neither is nor is not, neither comes to be nor ceases to be (Capreolus), 244n.49; in everything other than God is as received item in receiver, 244; is the form participated in order to subsist and endure, 195n.30; most formal,195n.28; cannot be identified with form or essence or substance in caused things, 190–91; cannot include composition, 193; too intimate to the essence to be a mere property, 174; knowledge of esse and knowledge of the maximally first principle, 192; knowing what esse is requires careful investigation, 192; knowledge of the mode of esse as found in the natural thing, 76; life, as particular case of esse, prime example of per accidens sensible, 191–92; name of an act or actuality, 18; does not participate in anything else, 193–94; not a per accidens predicable, 174 (against Owens, 169); per se result of form as form, 176; proper effect of the first agent, thus having role of ultimate end, i.e. final cause, 170–71, 204; reflection back on the phantasms and our knowledge of the nature of esse, 45; in Sent. appears once as formal cause, but in subsequent works as following formal cause, 189; in what sense called an “accident,” 174; most simple, 231; too simple to be first known just in itself, 44; substantial esse that whereby a thing is called “a being,” unqualifiedly, 191n.15; nothing suffices to be cause of its own esse, 169; universal form, 195; as a verb, 19 Action: remaining within the agent, is the act of the perfect, i.e. of a thing in act, and properly called “operation,” 213– 14; as ultimate act in a thing is called “second act,” and is the perfection and end of the thing, 214–15; vocabulary of 257 INDEX OF TOPICS 258 Index of Topics Action (cont.) movement extended to operation, and inversely, 214 Agent intellect: its abstractive power to be envisaged as a light, 39; causes the virtue called “understanding of principles,” 58n.29; flows from the essence of the soul, 226; and knowledge of terms of first principle, 5, 36, 58n.29; notion of being as its instrument, 46n.24 Being [ens]: best known of all objects both in itself and to us, 191n.14; common being [ens commune] as subject of metaphysics, 51n.9; has as differences the necessary and the contingent, 173–74; as divided by act and potency wider than being as divided by the categories, 24, 78, 210–11n.23; is divided according to the more and the less as divided by act and potency, 30; as divided by act and potency, and the consideration of causality, 78; as divided by act and potency, and consideration of change, 210, n.23; as divided by the categories, treated in Metaphysics books 7 and 8, 140; as a genus (in a wide sense), 17; already includes a first, confused knowledge of esse, 44–46, 191; as naming a nature, 16; as naming a unified field, 17; natural being [ens naturae] and notional being [ens rationis], 151; open to participation by intelligibilities other than esse, 193–94; as...

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