Heraclitus — Flux Study Portal

Further reading

• Stanford Encyclopedia of Philosophy — Heraclitus — the best single starting point; careful on the flux question and on which fragments are secure.
• Stanford Encyclopedia of Philosophy — Presocratic Philosophy — situates him among the Milesians, the Pythagoreans, Xenophanes and Parmenides.
• Stanford Encyclopedia of Philosophy — Stoicism — for the physics that inherits the logos and the cosmic fire.
• Internet Encyclopedia of Philosophy — Heraclitus — a fuller fragment-by-fragment walkthrough.
• Diogenes Laertius, Lives of the Eminent Philosophers, Book IX (Wikisource) — the ancient life, including the temple-of-Artemis story. Read it as tradition, not as record.
• John Burnet, Early Greek Philosophy (Wikisource) — an out-of-copyright English rendering of the fragments; dated in its interpretations, but useful for reading them in bulk.
• Hippolytus, Refutation of All Heresies (New Advent) — Book IX preserves the densest surviving run of fragments; note how the argumentative frame shapes what he chooses to quote.
• Perseus Digital Library — Greco-Roman collection — Greek and English texts of Plato's Cratylus and Theaetetus and Aristotle's Metaphysics, where the flux doctrine is paraphrased and then attacked.