From secondary causes to artificial instruments:Pierre-Sylvain Régis's rethinking of scholastic accounts of causation

Although several of Descartes's disciples established occasionalism as the natural outcome of Cartesianism, Pierre-Sylvain Regis forcefully resisted this conclusion by developing an account of secondary causes in which God does not immediately intervene in the natural world. In order to understand this view, it has been argued that Regis melds Aquinas's concurrentism with the new, mechanist natural philosophy defended in Cartesian physics. In this paper, I contend that such a reading of Regis's position is misleading for our understanding of both his account of secondary causality and the relationship between medieval debates and seventeenth century natural philosophy. I show that Regis's account of secondary causality denies two fundamental features at the core of the account proposed by Aquinas, namely that God acts immediately in nature and that secondary causes are per se causes. I contend that Regis's view more closely resembles a specific account of artificial instrumental causality developed by Duns Scotus. The comparison with Scotus shows that Regis is still dealing with conceptual tools that can be traced back to the scholastic tradition. Yet, Regis implements these tools to establish an account of causation that is fundamentally irreconcilable with scholastic natural philosophy. (C) 2016 Elsevier Ltd. All rights reserved