Abstract

Avicenna's theory of final causality stands out as one of the most profound and original achievements of Islamic philosophy. Writing mainly in Arabic in various cities of Persia from the end of the 4th/10th to the beginning of the 5th/11th centuries AH/AD, Avicenna extended the range of Aristotelian teleology to encompass not only motion but also existence; he did so by dividing the final cause into an extrinsic, kinetic end , and an intrinsic, static perfection . ;My dissertation is organized to test Avicenna's hypothesis that the final cause thus extended was applicable to every subject of every science. I begin by examining how the final cause behaves in the relations between logical entities--terms, premises, definitions, quiddities--and then argue that Avicenna saw the final cause as a bridge between that world of logical entities and the sensible world, whose own relations logic is supposed to systematize. I go on to explain how Avicenna used the twin aspects of Aristotle's notion of nature--one an extrinsic agent keeping the world of natural things in order, the other an intrinsic form serving as the natural thing's source of motion--as a basis for his division of final causes into ends and perfections; I also examine how this division helped Avicenna attempt a reconciliation of chance and natural necessity. I then assess how Avicenna's medical experience--specifically his close observation of the complex teleological processes that cause an organism to exist and function--provided empirical support for his distinction between ends and perfections. Finally I argue that Avicenna viewed the relation between final and efficient causes as one of reciprocal necessitation, based on the premise that each was both cause and effect of the other; here Aristotle's notions of limit and actuality provide some of the metaphysical background to Avicenna's teleology. ;Previous studies of Avicenna's theory of causality have focused almost entirely on the efficient cause; my intention here is to prove that an understanding of Avicenna's teleology should be a prerequisite to any future such study