Greece & Rome · c. 535–475 BCE
Heraclitus
Riddling sage of Ephesus who saw the world as ordered flux
Taught that all things flow and that opposites are one, held together by the logos, a hidden rational order; “you cannot step into the same river twice” is a later paraphrase. Fire, ever-changing yet kept in measure, is his image of the cosmos.
Life and thought
Heraclitus came from an old aristocratic family of Ephesus and was active around 500 BCE. He is said to have given up a hereditary office to his brother and to have deposited his single book, probably a collection of sharp, riddling sayings, in the temple of Artemis. He scorned the crowd and famous predecessors alike: Pythagoras’ “much learning”, he said, does not teach understanding.
His central claim is that the world is a unity of opposites held in tension by the logos, an order that is always there but that most people fail to notice. The road up and the road down are one and the same; sea water is drinkable for fish and deadly for people. Change is not the enemy of order but its form: fire, “kindled in measures and extinguished in measures”, is his image of the cosmos. The line about never stepping into the same river twice is Plato’s paraphrase. The Stoics later made his logos and fire the core of their physics.
Works
Shaped
c. 428–348 BCEPlatoAristotle says Plato learned the Heraclitean view that sensible things are in flux from Cratylus.c. 334–262 BCEZeno of CitiumStoic physics adopted Heraclitus’ logos and his divine, ordering fire.1844–1900Friedrich NietzscheGerman philologist who diagnosed the death of GodArgued against
c. 570–495 BCEPythagorasHeraclitus mocked Pythagoras’ “much learning”, which he said does not teach understanding.Criticised by
c. 515 – after 450 BCEParmenidesParmenides’ attack on “two-headed mortals” who say things both are and are not is often, though debatably, read as aimed at Heraclitus.Meanwhile, in other traditions
traditionally 599–527 BCE (many scholars: c. 499–425 BCE)MahāvīraTwenty-fourth Jain tīrthaṅkara, a contemporary of the Buddhatraditionally 6th c. BCELaoziLegendary sage credited with the Daodejingfl. 6th–5th c. BCEAjita KesakambalīMaterialist teacher of the Buddha’s time, named for his hair blanket551–479 BCE (traditional)ConfuciusTeacher from Lu who sought to revive the Zhou wayc. 480–400 BCE (debated; an older dating is c. 563–483 BCE)The Buddha (Siddhārtha Gautama)Founder of Buddhism, who taught a middle way out of sufferingOn the record
“You cannot step into the same river twice” is a later paraphrase of Heraclitus.
The line comes from Plato’s Cratylus (402a). Heraclitus’ authentic river fragment (B12) says something subtler: on those who step into the same rivers, other and other waters flow. He reportedly deposited a single book, probably a collection of sayings, in the temple of Artemis at Ephesus.
Parmenides’ attack on “two-headed mortals” is often, though debatably, read as aimed at Heraclitus.
Fragment 6 condemns mortals for whom “to be and not to be are the same and not the same” but names no one. Some scholars hear Heraclitus in it; others see a general target, and recent work stresses how much the two thinkers share. Even their relative dates are uncertain.
Sources: Stanford Encyclopedia of Philosophy, “Parmenides” · Stanford Encyclopedia of Philosophy, “Heraclitus”