Being
What-is, is; what-is-not cannot be thought. Change would require something to come from nothing. Reality is one, eternal, unmoving.
Becoming
Everything flows; you cannot step into the same river twice. Strife and change are the life of the cosmos, governed by the logos.
The Exchange
who answered whom
HeraclitusThe world is an ever-living fire, kindling and going out in measures. The road up and the road down are one.
ParmenidesMortals who know nothing wander two-headed, for whom to be and not to be are the same and not the same. Reason shows that what-is is ungenerated and imperishable.
PlatoBoth are right about different realms — the Forms are Parmenidean being; the sensible world is Heraclitean becoming.
AristotleChange is real — it is the actualization of a potential. Things become what they are capable of becoming.
Friedrich NietzscheHeraclitus will remain eternally right that being is an empty fiction. The “apparent” world is the only one.
The quarrel runs on: process philosophy (Whitehead, Bergson) versus substance metaphysics; the “block universe” of relativity versus the flowing time of experience. In India, the Buddhist doctrine of momentariness against the Vedāntic changeless Brahman is a strikingly parallel debate.
Sententiae
phrases in the originalPanta rhei
Origin. The summary of Heraclitus’ doctrine — but the phrase itself appears first in later writers (Simplicius); it is not among his fragments. — Heraclitus
⚠ A slogan about Heraclitus, not by him.
For impermanence and change.
Explore Next
related by shared connectionsWhat Is Time?
Flux and permanence, the moving image of eternity, Augustine’s puzzle, Kant’s form of intuition, eternal recurrence, Heidegger’s temporality.
The Pre-Socratics
The first Greek philosophers — from Thales to Democritus — who asked what everything is made of and replaced myth with argument.
What Can We Know?
The relay race of epistemology — from Plato’s Cave to Kant’s categories, via Descartes’ demon and Hume’s billiard balls.
The Forms
Plato’s eternal, perfect, unchanging realities — Beauty itself, Justice itself, the Good — of which the things we see are imperfect copies.
What Is Beauty — and What Is Art For?
From Plato’s ladder of love and Aristotle’s catharsis to Kant’s disinterested pleasure, Schopenhauer’s music and Nietzsche’s Apollo and Dionysus.
Nothing from Nothing
The ancient principle that nothing comes from nothing — the foundation of Greek physics and the target of the Christian doctrine of creation from nothing.