Boris Hennig

Descartes claims that God is a substance, and that mind and body are two different and separable substances. This paper provides some background that renders these claims intelligible. For Descartes, that something is real means it can exist in separation, and something is a substance if it does not depend on other substances for its existence. Further, separable objects are correlates of distinct ideas, for an idea is distinct (in an objective sense) if its object may be easily and clearly separated from everything that is not its object. It follows that if our idea of God is our most distinct idea, as Descartes claims, then God must be a substance in the Cartesian sense of the term. Also, if we can have an idea of a thinking subject which does not in any sense refer to bodily things, and if bodily things are substances, then mind and body must be two different substances

The sciences may be able to describe living beings, but this is not to account for their life. Life is not a describable property of things. There is also no philosophical a priori argument by which one could prove the existence of life – except perhaps our own. In order to understand what life is, we must start with our conception of that life that we know, human life, and reduce the notion of this life to a notion of mere life. We may do this by introducing the following distinctions. Intentional movements may succeed, be interrupted, or be mistaken. In contrast, merely teleological movements can only succeed or be interrupted, but not mistaken. Further, intentional movements are executed as more or less suitable means for achieving an end. Merely teleological movements are not performed as means to ends in this sense, but that does not render them less goal-directed.

I will in this paper attempt to extract a positive doctrine on the substantiality of the human soul from Ghazali"s critique of the Aristotelian philosophical tradition. Rather than reflecting on the possibilities and limitations of intercultural dialogue, my aim is to directly engage in such dialogue. Accordingly, I will not suppose that we need to develop and apply external standards according to which one of the two philosophical traditions addressed here, Western and Islamic, may turn out to be superior. Up to a certain point, Western and Islamic philosophy are virtually indistinguishable regarding their style, the main topics, and the arguments discussed, which both take over from Aristotle and the Neoplatonists. Further, at least up to Ghazali, no Islamic philosopher actually employs standards of rationality that would differ from the standards also accepted in the West. Ghazali himself would certainly be at least as disturbed by a valid philosophical objection to his claims as any other serious philosopher. He does not pursue another kind of project, but submits to the same standards of truth and validity, as far as philosophical argument reaches. His point is, of course, that these standards do not reach as far as some philosophers suppose. But this, again, is not a particularly "Islamic� insight