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Journal of the History of Philosophy 42.4 (2004) 489-490


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Ian M. Crystal. Self-Intellection and its Epistemological Origins in Ancient Greek Thought. Aldershot, England: Ashgate Publishing, 2002. Pp. x + 220. Cloth, $79.95.

In this excellent re-working of his King's College Ph.D. thesis, Ian Crystal presents an account of the problem of self-intellection in Greek philosophy from Parmenides through Plotinus. The problem, at least as it appears in ancient Greek philosophy, is connected to the way in which a faculty of soul relates to its proper object. For example, the proper object of the visual faculty is light, that of the auditory faculty sound, and it is the difference in kind between these proper objects that requires different faculties of soul in any account of how it is that we come to grasp the two different kinds of sensory data. Reason is itself a faculty of soul that is supposed to correspond to objects of cognition, but since it is possible to grasp, cognitively, the structure of this faculty the question arises: May this faculty function as its own object? The question is famously answered in the affirmative in Aristotle's treatise De anima at 430a2-5 on the grounds that any immaterial object of cognition is identical to thought itself (epi men gar tôn aneu hulês to auto esti to nooun kai to nooumenon).

While this may seem like a peculiarly Aristotelian analysis of cognition (relying, as it does, on Aristotle's distinction between matter and form and his rather cryptic claim that the faculties of soul are actually what their proper objects are potentially), Crystal traces the idea both backwards and forwards in time, rooting the problem in Parmenides' general account of faculties of soul and tracing it through Plotinus's sophisticated account of noetic intellect, with visits along the way not only with Aristotle but Plato and the Stoics as well.

The book is divided into three parts. In the first ("The Epistemological Origins") Crystal examines the evolution of the philosophical analysis of cognition from Parmenides through Plato. Parmenides, on this account, was the first to offer anything like a philosophical treatment of intellect (Greek nous). In particular, Parmenides distinguishes between a faculty of intellection and an object of that faculty. Plato, consciously working in the Parmenidean tradition, further analyses mind into its faculties and their proper objects but also gives a more detailed analysis of the epistemological subject. Specifically, Plato's treatment of the faculty in the Theaetetus provides an account of the structure of our cognitive faculty and how that structure relates to the metaphysics of the external world. It is here that Crystal recognizes the emergence of a linguistic component in the epistemic subject's cognitive activity (101; cf. Theaetetus189e6-190a6).

Part II ("The Emergence of Self-Intellection") consists of a single chapter in which Crystal reads Aristotle's treatment of self-intellection in the De anima as "Aristotle's epistemological response to Plato." Since self-intellection per se really only emerges for the first time in the De anima, this chapter is in some sense the meatiest part of the book. We are given first a careful treatment of Aristotle's account of perception in DA3.2, affection in DA2.5 and De generatione et corruptione1.7, and the central problem of self-consciousness in DA3.2. The argument moves quickly here but Crystal's analysis is precise and clear. Next comes the analysis of the cognitive structure of intellect itself in DA3.4 and Crystal's account of how Aristotle's two aporiai (How can intellect be both a passive affection and something simple and impassive; and Is intellect itself an intelligible object) are responses to Plato's account of cognition at Theaetetus197c1-200d4 (the Aviary passage) on the one hand and to the general lack of an account of intelligible objects in the Theaetetus on the [End Page 489] other. On Crystal's account, Aristotle improves on Plato in the sense...

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