- Acusilaus
- Aeschylus[26]
- Aristophanes, The Clouds[27]
- Euripides, Melanippe
- Heraclitus
- Hesiod, Theogony
- Homer, Cypria,[28] Iliad
- Parmenides
- Prodicus of Ceos, Praise of Heracles
- unspecified (likely lost) philosophical discourse on the utility of Salt
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