Philosophers today have largely given up on the project of categorizing being. Aristotle’s ten categories now strike us as quaint, and no attempt to improve on that effort meets with much interest. Still, no one supposes that reality is smoothly distributed over space. The world at large comes in chunks, and there remains a widespread intuition, even among philosophers, that some of these chunks have a special sort of unity and persistence. These, we tend to suppose, are most truly agents (...) and subjects, and are what exist in the most proper sense of the term. We believe, in other words, in substances. (shrink)

The concept of efficient causation originates with Aristotle, who states that the types of cause include ‘the primary source of the change or rest’. For Medieval Aristotelians, the scope of efficient causality includes creative acts. The Islamic philosopher Avicenna is an important contributor to this conceptual change. In his Metaphysics, Avicenna defines the efficient cause or agent as that which gives being to something distinct from itself. As previous studies of Avicenna's ‘metaphysical’ conception of the efficient cause attest, it takes (...) God as a model agent. This essay considers whether Avicenna's ‘metaphysical’ conception of the efficient cause applies to natural agents. It ultimately argues that Avicenna offers a unified view of the efficient cause, which includes both divine and natural agents. On this view, an efficient cause gives being to another and is simultaneous with its effect. While Avicenna's defence of this view is an important chapter in the history of the concept of the efficient cause, it is also of interest in its own right. By appeal to a version of the principle of sufficient reason, it challenges a widespread view that causes are temporally prior to their effects. (shrink)

In this essay, the author examines the problem of the composition of spiritual substances in Thierry of Chartres and Gundissalinus. While Thierry is reticent to admit a hylomorphism in spiritual creatures, Gundissalinus develops Thierry’s thought on the matter through al-Ghazālī’s and Ibn Daud’s treatment of the composition in spiritual substances. Gundissalinus concludes that spiritual creatures are composed of matter and form, a conclusion that would be unacceptable to his main philosophical authorities.

Peut-on prouver que l’âme raisonnable est par elle-même et essentiellement forme du corps? C’est pour résoudre cette question que des générations de lecteurs d’Averroès recourent à la distinction entre forme inhérente et forme assistante. On examine l’histoire de cette distinction dans l’après-coup du concile de Vienne (1312) et du concile de Latran V (1513), dans sa triple dimension noétique, ontologique et anthropologique. On présente les sources et les divers aspects de la théorie averroïste de la forme assistante, de Siger de (...) Brabant à la scolastique tardive et à la première modernité, selon laquelle l’intellect n’est ni forme inhérente ni moteur séparé, mais forme séparée. (shrink)