Mythos and Logos: What Was Genuinely New in the Presocratics

Many people call the Presocratics the first masters of rational thought. Jonathan Barnes made this case as well as anyone in The Presocratic Philosophers, arguing that with the Milesians people first began to back their claims with reasons instead of simply asserting them. For a long time, European histories of ideas have treated these thinkers as the place where reason itself begins: the thin bright line between the darkness of myth and the daylight of philosophy.

The claim deserves a closer look, because it is wrong in two ways at once. Reason did not switch on in sixth-century Miletus. People had been thinking carefully and systematically for thousands of years before Thales was born. And the supposed clean break with myth, the moment when natural events stopped being the moods of gods and became the workings of law, is far less clean than the story requires. Much of what we admire in these men is a portrait their modern readers painted, looking back across 2,500 years for an ancestor who resembled themselves.

The best guide to both corrections is a book published in 1951, decades before the modern portrait reached its finished form: E. R. Dodds’s The Greeks and the Irrational, first delivered as the Sather Lectures at Berkeley. Dodds was an Oxford classicist and a committed rationalist, and that combination is exactly what makes him useful. He wanted to honor the Greek achievement in reason, and he believed it could only be understood once you saw how much irrational belief, ecstatic religion, and magical practice surrounded it and ran through it.

Because when all of that is granted, something stubborn remains. Something did change in the Greek texts. It is not the thing the textbooks usually name, and it survives both the oldest attack on it, Aristotle’s, and the newest. This essay tries to say plainly what it was.

Reason Did Not Begin in Miletus

Long before anyone in Miletus looked at the sky and asked what it was made of, other societies were solving hard problems by careful observation and organized thought.

In Mesopotamia, scribes built a number system based on 60 that still survives in our minutes and degrees. An Old Babylonian tablet known as Plimpton 322, written around 1800 BCE, lists sets of numbers that satisfy the relationship we call Pythagorean, more than a thousand years before Pythagoras. Another tablet, YBC 7289, gives the square root of two correct to about six decimal places. Babylonian scholars recorded the movements of the planets for centuries, and the Code of Hammurabi (c. 1754 BCE) sets out its laws in the step-by-step form of the conditional: if this happens, then that follows. In Egypt, the Rhind Mathematical Papyrus (c. 1550 BCE) works through what are in effect algebraic problems, and the Edwin Smith Papyrus records surgical cases one by one, pairing each injury with an examination, a prognosis, and a treatment, with almost no appeal to magic.

Nor were the Greeks alone even in their own era. In India, the geometric rules of the Shulba Sutras, whose dates are uncertain but may reach back before Pythagoras, include the same right-triangle relationship, and Panini’s grammar of Sanskrit, the Ashtadhyayi (probably fourth century BCE), lays out a rule system so exact that modern linguists compare it to a formal language. In China, the Mohist logicians and the thinkers later grouped as the School of Names argued about how words attach to things, while a vast administrative state ran on organized, bureaucratic reasoning.

None of this was philosophy in the Greek sense, and that is precisely the point. The capacity to think carefully is not the same as the particular kind of writing the Greeks happened to develop. Calling earlier peoples irrational confuses the form of thought with the power of it.

It also helps to remember what myth was for. Stories were not failed science. They were organized models: they held communities together, stored hard-won knowledge about the natural world, and packed cause and effect into a form that could be carried across generations. People who navigated open ocean by the stars, or raised the Great Pyramid with startling precision, were running long, exact chains of geometry and measurement. Not writing a treatise is not the same as not reasoning. David Graeber and David Wengrow’s The Dawn of Everything spends much of its length on this point: the deep past is full of complex, self-aware societies that older scholarship flattened into a single “pre-rational” blur.

Dodds made a related move from the other direction. Instead of defending other peoples against the charge of irrationality, he took away the Greeks’ exemption from it. He examined them with the same tools that anthropologists and psychologists applied to any culture: Ruth Benedict’s distinction between shame and guilt, fieldwork on spirit possession and shamanism, the psychology of dreams. Once the Greeks are treated as one people among others rather than as the miraculous exception, the story of reason being born in a single place loses its footing. Reason did not begin there, and the irrational did not end there.

The Portrait and Its Painters

If the Presocratics were not the first to think clearly, were they at least the first to separate nature from the gods? Here a second problem appears, and this one concerns us rather than them.

Dodds opens his book with an anecdote. While he was looking at the Parthenon sculptures in the British Museum, a young man came up to him and confessed that Greek art left him cold, because it was all so rational. The remark summed up two centuries of European admiration, from Winckelmann’s “noble simplicity and quiet grandeur” to Matthew Arnold’s “sweetness and light”: the Greeks as a people of balance, proportion, and daylight. Dodds wrote the book to show that this picture was, at best, half of the truth.

The early philosophers are where that half-truth breaks down most visibly. Read in full, the men we file under “the first philosophers” do not behave much like philosophers. Thales, the supposed founder of natural science, is reported by Aristotle to have said that all things are full of gods (On the Soul 411a). Parmenides did not present his logic in a seminar. He wrote it as an epic poem framed as a revelation: he rides a chariot to the gates where the paths of Night and Day divide, and a nameless goddess receives him and discloses the truth. Pythagoras led a secretive religious brotherhood that treated number as sacred, abstained from certain foods, and taught that souls pass from body to body; the legends around him include a golden thigh and the power to appear in two places at once. Empedocles told his fellow citizens that he walked among them as a deathless god, no longer mortal (DK 31 B112), and promised his student the power to calm the winds, bring the rain, and lead the dead back from Hades (DK 31 B111).

These are not the habits of laboratory scientists, and Dodds offered the most influential account of why. Building on the Swiss scholar Karl Meuli, he argued in his fifth chapter, “The Greek Shamans and the Origin of Puritanism,” that Greek colonization of the Black Sea coast brought the Greeks into contact with the shamanic cultures of Scythia and Thrace. Through that contact came a new idea: the soul as an occult self, detachable from the body, older than it, and able to survive it. Dodds traced a line of legendary Greek figures who looked like shamans, among them Abaris, Aristeas, Hermotimus, and Epimenides, and set Pythagoras and Empedocles at the end of it. On Empedocles he was especially pointed. Scholars had long puzzled over how the same man could write a sober physics of four elements and a religious poem about the fall and purification of the soul. Dodds answered that the puzzle is anachronistic. Empedocles belongs to an older type, the shaman, for whom healing, prophecy, poetry, and natural speculation were one vocation rather than separate careers. Later scholars, notably Walter Burkert and Peter Kingsley, extended this frame to Parmenides, reading his chariot journey as a descent to the underworld of the kind that shamans and initiates claimed to make.

The shaman thesis has not gone unchallenged. Jan Bremmer and others have argued that the evidence for Scythian influence is thin and that much of the Greek material can be explained without it. But the challenge concerns where these ideas came from, not whether they were there. No serious reader now denies that the founders of Greek philosophy were embedded in ecstatic religion, purification ritual, and claims to supernatural power.

That is what makes the next chapter of the story so striking. A generation after Dodds, philosophers working in the analytic tradition, shaped in its early decades by logical positivism, went back to these same texts looking for what resembled modern logic and science. They found chains of deduction, lifted them out, and set aside the religious, political, and poetic world in which they had been forged. Barnes is the most distinguished representative of that project. Karl Popper, no positivist himself but sharing its preference for testable claims, read the Presocratics through his own philosophy of conjecture and refutation in a famous 1958 lecture, “Back to the Presocratics.” The result was a Parmenides and a Heraclitus who sound a great deal like Oxford professors. Dodds had already shown in detail what this portrait leaves out. The real Presocratic mind is messier, stranger, and more interesting.

And Yet, Something Shifts

None of this settles the question, because the analytic readers were not imagining things. They were responding to something real in the texts, even if they described it badly.

To see what it was, start with the baseline. Dodds’s first chapter, “Agamemnon’s Apology,” examines a scene in the nineteenth book of the Iliad. Agamemnon has seized Achilles’ prize and nearly destroyed the Greek army, and when he finally makes amends, he denies that he was the cause: Zeus, Fate, and the Fury who walks in darkness, he says, cast a wild delusion (atē) into his mind in the assembly. Dodds showed that this is not a lame excuse but a whole psychology. Homeric heroes regularly experience sudden courage, sudden insight, sudden folly, and sudden knowledge as things put into them from outside by a god. Dodds called this “psychic intervention.” In such a world, a person is less the author of his thoughts than the place where they arrive. Knowledge works the same way: it is something you are given.

Now set Parmenides against that baseline. A goddess is speaking, and still she does not ask for faith. She tells him not to let habit or the senses drive him, and then gives an instruction with no parallel in Homer (DK 28 B7): krinai de logōi, judge by reasoning the much-contested refutation she has given. The word for reasoning is logos. The word for refutation, elenchos, is the word for cross-examination and testing. The message arrives wrapped in a vision, but the instruction attached to it is to weigh the argument and look for the weak point. Nobody checks the Muse’s work. Parmenides is told to check the goddess’s.

The second sign is argument that runs from one generation to the next. The Presocratics read each other and tried to break each other’s reasoning. Parmenides argued that “what is not” cannot be. From this he concluded that there can be no empty space, and so no real motion. The atomists Leucippus and Democritus, as Aristotle reports (On Generation and Corruption 1.8, 325a), accepted the structure of his argument and ran it backward: we plainly do see motion, motion requires emptiness to move into, so emptiness must exist. Historians did not impose this pattern from outside. It is a recorded exchange in which one thinker turns another’s logic against his conclusion. Whatever else is happening, that is new.

Four Changes You Can See in the Texts

The shift is easiest to see when the new texts are set beside the older ones they grew out of. Four changes stand out.

First, human judgment replaces divine authority. In Homer and in the Near Eastern epics, truth descends from above and human beings receive it. Before the Catalogue of Ships in the second book of the Iliad, the poet asks the Muses for the names of the leaders, and gives his reason:

Tell me now, Muses who dwell on Olympus, for you are goddesses, you are present and know all things, while we hear only rumor and know nothing. (Iliad 2.484–486)

This is psychic intervention applied to knowledge. Human memory and inquiry are worth nothing here; truth is a gift you can only ask for. Against it stands Parmenides’ goddess (Laks–Most D8, DK 28 B7), who tells him to judge her proof by reasoning alone. The speaker is still divine. The instruction is not. She hands the verdict to the listener’s own mind.

Second, impersonal order replaces the personalities of gods. In the Babylonian creation epic, the Enuma Elish, the world is built from a god’s corpse: Marduk splits the slain Tiamat in two like a fish laid out for drying, raises half of her as the sky, and posts guards so that her waters cannot escape. The structure of the cosmos is the aftermath of a battle. Anaximander describes the same universe in an entirely different way (Laks–Most D6, DK 12 B1), saying that things perish back into what they came from:

…according to what must be: for they pay penalty and retribution to one another for their injustice, according to the ordering of time.

There are no characters in that sentence. The elements settle their debts under an impersonal law, described in language borrowed from the courtroom and the city, and time keeps the record. The gods have not been argued away. They have been given nothing to do.

Third, knowledge becomes human work rather than divine gift. The Odyssey opens by casting the poet as a mouthpiece: “Tell me, Muse, of the man of many turns.” The Muse supplies the story; the singer voices it. Xenophanes breaks that circuit (Laks–Most D53, DK 21 B18):

The gods did not reveal all things to mortals from the beginning; but in time, by seeking, they find out better.

This may be the oldest statement of the idea of progress in the Western record. Truth is not handed over complete at the start. It is approached slowly, by inquiry, and it stays open to revision. One line moves the source of knowledge out of heaven and into human time.

Fourth, the gods made in our image are exposed as projections. Xenophanes does not just set the gods aside; he explains why people picture them as they do (DK 21 B15 and B16):

If cattle and horses or lions had hands and could draw and make works as men do, horses would draw the forms of gods like horses, and cattle like cattle. The Ethiopians say their gods are snub-nosed and black; the Thracians, that theirs are blue-eyed and red-haired.

This is not a myth about the gods. It is an argument about why people believe in the gods they believe in. With one comparison across cultures, Xenophanes turns religious imagery into evidence of human bias. Dodds placed Xenophanes at the head of what he called the Greek Enlightenment, the rationalist critique of what he named, borrowing a phrase from Gilbert Murray, the “Inherited Conglomerate”: the accumulated mass of religious belief that each age added to without ever clearing away what came before. Dodds insisted that this critique was real, and also that it was confined to a small educated minority. We will come back to that second point.

Heraclitus and the Logos

Heraclitus of Ephesus, writing around 500 BCE, pushes all of this further than anyone before him. His instrument is a single word, logos. In ordinary Greek it meant speech, account, or reckoning. Heraclitus gives it a new weight, close to the measure or proportion that holds the world together. With it he does not merely strip the gods of their personalities. He demotes them to staff.

He begins by separating the truth from himself. He is not an authority to be obeyed (Laks–Most D46, DK 22 B50):

Listening not to me but to the logos, it is wise to agree that all things are one.

Do not believe it because I said it, he tells his readers. Listen to the order itself, which is there for anyone to find. And he insists that it is there for anyone. The logos, he says, is common to all, yet most people live as though they had a private understanding of their own (DK 22 B2). Elsewhere he draws the same contrast through sleep: the waking share one common world, while each sleeper turns away into a world of his own (DK 22 B89). The line gains force from Dodds’s chapter on dreams, which shows how often the Greeks treated dreams as real visitations, messages from gods that could carry religious and even legal authority. For Heraclitus, private visions are exactly what does not count. Truth is what belongs to the shared, waking world, and so it is what anyone can check.

Next he removes the maker of the world. This cosmos, the same for all, was made by no god and no man; it always was, is, and will be, an ever-living fire kindled in measures and quenched in measures (Laks–Most D85, DK 22 B30). There is no creation, no creator, no first day, only fixed proportions that the world maintains for itself. Even the sun answers to them: it will not overstep its measures, and if it tried, the Furies, ministers of Justice, would hunt it down (DK 22 B94). Justice here is not a goddess who answers prayers. It is the name for the fact that the system corrects itself.

Yet Heraclitus is no secular modern either, and this is where Dodds’s picture matters. He still speaks of Furies and of Justice. He declares, with deliberate shock, that Dionysus and Hades are the same (DK 22 B15). His quarrel is not with the sacred as such but with how his contemporaries handle it. People who purify themselves of bloodshed with fresh blood, he says, are like someone who has stepped in mud trying to wash it off with mud; and those who pray to statues might as well be chatting with houses, knowing nothing of what gods or heroes are (DK 22 B5). The mystery rites, as people practice them, he calls unholy (DK 22 B14). He is a critic standing inside the religious world Dodds describes, not a scientist standing outside it. That is precisely what makes his demand that we listen to the logos, and not to him, so remarkable.

Conflict gets the same treatment. In myth, strife happens when gods lose their tempers. For Heraclitus, strife is the structure that makes a stable world possible. The bow and the lyre work only because opposing tensions pull against each other in exact balance; release the opposition and the string goes slack and silent (Laks–Most D49, DK 22 B51). He states the principle in a compressed, riddling fragment (Laks–Most D47, DK 22 B10):

Things taken together: wholes and not wholes, converging and diverging, consonant and dissonant; from all things one, and from one all things.

Day and night, summer and winter, are not battles between rival powers. They are the swing of one self-balancing order.

Aristotle’s Attack

Within two centuries, this had earned Heraclitus a formidable enemy. Aristotle was the first to state the Law of Non-Contradiction explicitly: the same thing cannot both belong and not belong to the same subject, in the same respect, at the same time. When he read the fragments on the unity of opposites, he did not see wisdom. He saw the foundation of thought under attack.

In Book Gamma of the Metaphysics, he makes non-contradiction the firmest of all principles and names Heraclitus as the chief suspect (1005b):

It is impossible for anyone to believe the same thing to be and not to be, as some think Heraclitus says.

If you truly believed that a thing both is and is not at once, Aristotle argues, you would hold contradictory beliefs at the same moment, which no mind can do. And the cost is not merely private confusion. If opposites are the same, meaning collapses (1006b):

Not to signify one thing is to signify nothing, and if words signify nothing, discussion with others is destroyed, and in truth discussion with oneself as well; for it is impossible to think anything without thinking one thing.

If “river” can mean river and not-river, the word points at nothing. A person who refuses to hold any word to a single meaning, Aristotle says, is no better than a plant (1006a).

He also offers a diagnosis. Later in the same book (1010a) he describes followers of Heraclitus who, seeing the sensible world change without pause, concluded that nothing true can be said about it. The most extreme was Cratylus, who criticized Heraclitus for saying you cannot step into the same river twice, since in his view you could not do it even once, and who ended, Aristotle reports, by refusing to speak and merely moving his finger. It was Plato, in the dialogue named after Cratylus (402a), who fixed the famous “you cannot step twice into the same river” as the core of Heraclitus’s thought. Aristotle’s view is that this whole line mistakes change over time for contradiction at a single instant. The river stays the same river in form and identity while new water runs through it; only careless wording makes it sound as if it both is and is not itself at once.

He had a stylistic complaint too. In the Rhetoric (1407b), he grumbles that Heraclitus is hard to punctuate: in the opening sentence of his book, you cannot tell whether the word “always” goes with what comes before or after it.

There is a sharp irony here. Barnes praised the Presocratics for putting argument above assertion. Yet Aristotle, the man who built formal logic, looks back at Heraclitus and finds the reverse: a poet dealing in riddles and shocks where he should have offered clean reasoning. By the very standard the tradition uses to honor the Presocratics, their own great systematizer convicts one of the greatest of them.

The Modern Vindication of Heraclitus

Modern scholarship has largely reversed the verdict. Readers such as Charles Kahn, Edward Hussey, and above all Daniel W. Graham argue that Aristotle misread his man: he forced a dynamic, metaphorical thinker into his own framework of fixed definitions and then faulted him for not fitting.

The case rests on reading the fragments in context. Take the sea (DK 22 B61): it is the purest water and the foulest, drinkable and life-giving for fish, undrinkable and deadly for human beings. Aristotle hears a flat contradiction, water that is both pure and not pure. But Heraclitus is not assigning the sea two absolute properties at once. He is pointing out that “pure” and “polluted” are relations, not fixed facts; they depend on whose body is drinking. The sea is healthy for the fish and deadly for the man at the same time, with no contradiction at all. The same reading resolves the road that is one and the same going up and going down (Laks–Most D51, DK 22 B60): a single hillside path is an ascent for the climber and a descent for the walker coming home. The opposed descriptions do not cancel the path. Both are needed to describe it fully.

The river is the deepest case (Laks–Most D65b, DK 22 B12):

Upon those who step into the same rivers, different and again different waters flow.

Plato and Aristotle took this to mean that nothing keeps a stable identity. Graham reads it the other way around, as a new theory of what identity is. A river is not a stable lump of matter. It is a pattern that exists only because the water keeps moving. Stop the flow and you have a pond or a dry bed, not a river. Change does not destroy the river’s identity. Change is what constitutes it.

This is the heart of Graham’s reading, set out in Explaining the Cosmos and supported by his edition of the sources, The Texts of Early Greek Philosophy. Heraclitus is not claiming that everything is really fire in the way Thales was said to claim that everything is water. Fire is his figure for transformation itself: not a substance but a process, a continuous burning that consumes and converts. Read this way, the supposed contradiction never arises. A flame keeps its shape precisely because it never keeps its material. A body remains itself for decades while its matter is continually replaced. Large structures stay stable because what composes them is constantly being exchanged. That is not a failure of logic. It is an early, and rather good, description of what we would now call a dynamic system.

Close study of the texts has strengthened the case. The most important recent tool is the nine-volume Loeb Early Greek Philosophy of André Laks and Glenn W. Most (2016), which has become a standard working edition alongside Diels–Kranz. For a century the fragments were cited by DK numbers, which for Heraclitus follow, roughly, the alphabetical order of the ancient authors who happened to quote them. That arrangement scatters related thoughts and strips away context. Laks and Most reorganize by theme, grouping the testimonies about doctrine under headings such as the logos, cosmic fire, the unity of opposites, and the soul, and marking them with a D, so that the river fragment, DK B12, becomes D65b, and the logos fragment, DK B50, becomes D46. Simply arranging Heraclitus by subject rather than by accident of transmission makes the shape of his thought visible in a way the old numbering obscured.

The Greek tells the same story. Heraclitus favors verbs of ongoing action over nouns of fixed being. In the river fragment the waters are flowing on, in a present tense of unbroken motion; the word “same” attaches to the rivers, while “different” attaches to the waters, so that a single thing is held together by the many things streaming through it. The word logos itself, set against the ordinary uses of the period, carries the sense of an account or reckoning, a proportion or balance, rather than a sacred Word. Matter changes form endlessly, but the measures in which it changes hold constant.

Even Aristotle’s complaint about punctuation turns into evidence for the defense. Kahn’s reply, in The Art and Thought of Heraclitus, is that the ambiguity in the first sentence is the technique. Heraclitus left “always” suspended between the two readings on purpose, so that it describes both the everlasting logos and our everlasting failure to grasp it. The sentence is built to make the reader’s mind do what the sentence is about. What Aristotle took for carelessness was design.

What Actually Began

So where does this leave the claim we started with?

It leaves it half true and badly described. The Presocratics did not invent reason; reason is older than any of them, and the long human past is full of it. Nor were they the cool, secular logicians their modern admirers wanted. Dodds’s evidence makes that plain: they were poets, healers, and founders of religious brotherhoods, men who claimed divine status and journeys to the gates of Night, who were doing something new in the middle of all that. The analytic portrait gets the texture wrong, and that matters, because it hides how strange and how mixed the achievement was.

But there was an achievement. It was not the separation of reason from religion; they never made that separation and would not have understood the wish to. It was something narrower and more durable. They began, clumsily, to pull apart two things that myth had always held together: the authority of the speaker and the truth of the claim. Parmenides’ goddess tells him to test her refutation. Heraclitus tells his readers to listen past him to a logos that is common to all, and to distrust truths that live only in private visions. Xenophanes turns the gods into a case study in human projection and treats knowledge as a search that is never finished. In each case the question shifts from who said it to whether it holds up.

This conclusion lands close to Popper’s, who saw in the Presocratics the start of a tradition of critical discussion. The difference lies in the route. Popper found that tradition by setting the religion aside. Dodds lets us see that it emerged from inside the religion, often from the very men who were most deeply in it. The demand to judge by reasoning first appears in the mouth of a goddess, in a poem about a journey to the underworld. Historians such as G. E. R. Lloyd have added a social explanation: Greek cities were places of open, competitive argument in assemblies and law courts, where a speaker could be challenged by anyone and had to win over an audience that judged for itself. The habit of demanding reasons had somewhere to live.

Dodds adds one more lesson, and it is a sobering one. His final chapters, culminating in “The Fear of Freedom,” argue that the Greek Enlightenment was always a minority affair and never cleared away the Inherited Conglomerate. In classical Athens it provoked a backlash: Dodds took seriously the ancient reports of impiety prosecutions against Anaxagoras, Protagoras, and finally Socrates (later scholars, notably Kenneth Dover, have doubted several of them, though not Socrates’ trial). In the Hellenistic and Roman centuries, by Dodds’s account, much of Greek culture turned back toward astrology, magic, and revelation, retreating from the burden of judging for oneself. The thing the Presocratics began was neither inevitable nor secure. It could be, and for long stretches was, abandoned.

That is why the part that survives every attack deserves to be stated carefully. When Aristotle accuses Heraclitus of breaking the Law of Non-Contradiction, and when Barnes, much later, praises the Presocratics for putting argument above assertion, both men are doing exactly what the Presocratics made available. They are holding a text accountable: demanding that it be consistent, that it make sense, that it stand up to examination. You cannot make that demand of the Enuma Elish. There is no seam in it to test, because its authority is the authority of the gods, full stop. You can make that demand of Heraclitus, and people have been making it for 2,500 years. The fact that we still argue about whether his river fragment makes sense is not a sign that he failed. It is the clearest possible sign of what he and his contemporaries began. The argument about Heraclitus is itself their inheritance.

That is the genuine thing. Not a clean break, not the birth of pure reason, not a seminar of Oxford logicians in sandals, but a new and lasting demand: that a claim about the world answer to the world, and to anyone willing to check, rather than to the standing of whoever made it. They did not finish the work, and as Dodds reminds us, it can be lost as well as won. But they were the first to ask us to judge by reasoning. The instruction has outlasted the goddess who gave it.