Fragments

Summary

Heraclitus's book does not survive; what remains are roughly 130 short sayings preserved as quotations by later authors such as Plato, Aristotle, Plutarch, Sextus Empiricus, Clement of Alexandria, Hippolytus and Diogenes Laertius. Modern editions number them according to Hermann Diels and Walther Kranz (DK), and the reference edition presents them in a fresh translation with commentary. The fragments are compressed, paradoxical aphorisms, and their arrangement is the work of editors, but several connected ideas run through them. First is the logos, the account or principle according to which all things happen, which is common to all and yet which most people fail to understand even after they hear it, living as if asleep in private worlds. Second is perpetual change: the world is an ever-living fire, kindling in measures and going out in measures, and all things are exchanged for fire as goods for gold. The famous river fragments say that one cannot step twice into the same river, because different waters flow on; identity persists through, and because of, constant flow. Third is the unity of opposites: the way up and the way down are one and the same; sea water is purest and most polluted, drinkable and healthy for fish, deadly for humans; sickness makes health pleasant, hunger makes satiety, weariness rest. Strife or war is the father of all, and justice is strife, since the tension of opposites, like that of the bow and the lyre, makes harmony. Fourth is a psychology of the soul linked to physics: souls come from and pass into water, the dry soul is wisest and best, and a drunk man, whose soul is moist, is led stumbling by a boy. The boundaries of the soul cannot be found, so deep is its measure. Other fragments mock polymathy, Homer and Hesiod, Pythagoras, popular religion, blood purification and the worship of images, praise the few excellent over the many, and make terse ethical claims, notably that character is a person's fate. Ancient biographies add colourful anecdotes, including his misanthropy and a death from dropsy that he tried to treat himself.

Top Lessons

• Change is the condition of being

  Heraclitus holds that things remain what they are only by changing, like a river. The fragments invite readers to see stability and flux as partners rather than opposites.

• Opposites depend on each other

  Health makes sense only against sickness, rest against weariness. Heraclitus suggests that tension and contrast are the structure of experience.

• Most people sleepwalk

  Heraclitus criticises those who live in private worlds and fail to attend to what is common. His fragments demand alert attention and self-inquiry.

Verified Quotes

Medical Lens

Heraclitus offers one of the earliest Greek psychologies tying mental states to physical substances: the soul's quality varies with moisture and dryness, so drunkenness 'moistens' the soul and wisdom is 'dry'. This anticipates, without being identical to, later Hippocratic and humoral explanations of temperament and intoxication. Fragments on sleep and waking (sleepers live in private worlds) are often quoted in discussions of dreams and consciousness. A fragment about physicians who cut and burn patients and demand fees illustrates the unity of opposites with an early, sardonic glance at surgery. Diogenes Laertius's story that Heraclitus died of dropsy after trying to cure himself by burying himself in dung, and his riddle to the doctors about turning rain into drought, are colourful but unreliable ancient anecdotes. Sickness making health pleasant (DK 111) is a frequently cited line on contrast in experience.

• DK 117–118

  The drunk man with a moist soul led by a boy; the dry soul as wisest.

• DK 58

  Physicians who cut and burn the sick and demand a fee, given as an example of good and ill being one.

• DK 111

  Sickness makes health pleasant and good, hunger satiety, weariness rest.

• DK 21, 26, 75, 89

  Fragments on sleep, death and waking; sleepers each turn into a private world.

• Diogenes Laertius, Lives IX.3–4 (ancient testimony)

  Account of Heraclitus's dropsy, his riddle to the physicians and his attempt to cure himself with dung.