SOURCE: David Wiggins, "Heraclitus' Conceptions of Flux, Fire and Material Persistence," in Language and Logos: Studies in Ancient Greek Philosophy Presented to G. E. L. Owen, edited by Malcolm Schofield and Martha Craven Nussbaum, Cambridge University Press, 1982, pp. 1-32.
In the following essay, Wiggins explores the context and meaning of Heraclitean theories of flux, fire, and material persistence, arguing that Heraclitus developed these concepts as a response to the natural philosophy of the Milesian thinkers Anaximander, Anaximenes, and Thales.