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Vincent Carraud. Causa sive ratio. La raison de la cause, de Suarez à Leibniz. Paris: Presses Universitaires de France, 2002. Pp. 573. euro 42,00.
Over the last two decades, there has been a good deal of outstanding work on the problem of causation in early modern philosophy. Some of it has been devoted to first-order questions: for example, on whether this or that thinker allows for real causal activity among finite substances (and which ones). Other studies, by contrast, have focused on second-order questions, especially the proper formulation of the causal principle itself. Vincent Carraud's book is primarily concerned with second-order questions, although it does have something to say with respect to first-order questions as well. But the depth and breadth of this study makes it much more than just another entry in the ongoing discussion over who thought what about causality among the early moderns. Carraud has a large and complex story to tell: the development of the principle of sufficient reason in the seventeenth century. In particular, he wants to know which philosophers can truly be said to have adopted that principle in its most rigorous formulation. It is both a philosophical and a historical story, and it appears in what is surely one of the most important and interesting books in early modern philosophy in recent years.
Carraud directs our attention to a particular phrase that originates with Descartes but then seems to reappear (in various forms) throughout the period: causa sive ratio, "cause or reason." Every term in the phrase is subject to interpretation, of course-'cause,' 'reason' and especially 'or'-and the thesis it embodies (and a philosopher's attitude toward it) is a function of how those terms are to be...