The Physics of Pneuma in Early Stoicism

In Sean Coughlin, David Leith & Orly Lewis (eds.), The Concept of Pneuma after Aristotle. Berlin: Edition Topoi. pp. 171-201 (2020)
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Abstract

This chapter examines the ancient Stoic theory of the physical composition of pneuma, how its composition relates to pneuma’s many causal roles in Stoic philosophy, and to what extent each of the first three leaders of the Stoic school accepted the claim that pneuma pervades the cosmos. I argue that pneuma is a compound of fire and air. Furthermore, many functions of pneuma can be reduced to the functions of these elements. Finally, it is likely that each of the early Stoics posited a pervasive cosmic pneuma. This paper also explores the nature of pneuma’s tensile movement and offers an account of fire and air’s roles in causing its motion.

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Ian Hensley
East Tennessee State University

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