Heraclitus: everything flows
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What if the thing that stays the same about a river is precisely that it never stops changing?
Heraclitus of Ephesus (active around 500 BCE) asked a different question from the Milesians. They asked what stuff the world is made of. He asked what pattern the world moves by. His answer: reality is not a thing but a process.
His most famous slogan is usually given as panta rhei = “everything flows.” The world is in ceaseless change; nothing you point at is truly static. Stability is the illusion; flux is the truth.
The river fragments make this concrete. In the best-attested one (DK B12) Heraclitus says that on those who step into the same rivers, ever different waters flow. The river keeps its name and its banks, yet the water is never the same water twice.
What is the deep point of Heraclitus' river image?
But flux is not lawless. Behind the changing world runs the Logos (logos = word, account, measure, rational law). It is the underlying rational structure by which all things happen — and, Heraclitus complains, most people live as though asleep to it.
The Logos shows itself above all in the unity of opposites: opposites are not two separate things but the poles of one connected reality. Remove one and you lose the other.
His master-image for the whole process is fire. Fire is the least thing-like of things — it exists only by consuming and transforming. This world-order… was ever, is, and shall be: an ever-living fire, kindling in measures and going out in measures (B30). Fire is change that keeps to a ratio — flux plus Logos in a single symbol.
How does Heraclitus differ most sharply from the Milesian philosophers (Thales, Anaximenes)?