“The heavenly bodies are made of the same stuff as the earth.”
— Thales of MiletusCommonly cited paraphrase of Thales' cosmology in later doxography; no verbatim source identified
Commentary
This paraphrase attributes to Thales a view that the heavenly bodies share the material constitution of the earth, a claim that would have made celestial phenomena subject to the same kind of explanation as terrestrial ones. The idea, if correctly attributed, represents an early step towards a unified account of nature. G. S. Kirk, J. E. Raven, and M. Schofield note that such claims appear in the later doxographical tradition and are not directly attested in the fragments. Charles Kahn argues that the Milesian project of explaining the cosmos through a single material principle would naturally extend to the heavens. Jonathan Barnes observes that the attribution is uncertain and that the paraphrase may reflect later interpretations. W. K. C. Guthrie discusses the image of the heavens in early Ionian thought and notes that the evidence is fragmentary. The sentence is a paraphrase and should be labelled as such, with the primary doxography checked before any quotation.
Commentary
This paraphrase attributes to Thales a view that the heavenly bodies share the material constitution of the earth, a claim that would have made celestial phenomena subject to the same kind of explanation as terrestrial ones. The idea, if correctly attributed, represents an early step towards a unified account of nature. G. S. Kirk, J. E. Raven, and M. Schofield note that such claims appear in the later doxographical tradition and are not directly attested in the fragments. Charles Kahn argues that the Milesian project of explaining the cosmos through a single material principle would naturally extend to the heavens. Jonathan Barnes observes that the attribution is uncertain and that the paraphrase may reflect later interpretations. W. K. C. Guthrie discusses the image of the heavens in early Ionian thought and notes that the evidence is fragmentary. The sentence is a paraphrase and should be labelled as such, with the primary doxography checked before any quotation.