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Known asThales of Miletus
Occup.Philosopher
FromGreece
Born624 BC
Miletus
Died546 BC
Miletus
Background and Identity
Thales of Miletus is conventionally dated to a life spanning roughly from 624 to 546 BCE. He was a Greek from the Ionian city of Miletus on the coast of Asia Minor, an important port where ideas and techniques from the eastern Mediterranean circulated. Later tradition places him among the Seven Sages, alongside figures such as Solon of Athens and Bias of Priene, a sign of his reputation for practical wisdom as well as inquiry. While he is widely treated as a philosopher, mathematician, and astronomer, no writings by him survive with certainty, and nearly everything known about his ideas is reported by later authors.

Sources and Historical Uncertainty
The principal testimonies about Thales come from Aristotle, Herodotus, Diogenes Laertius, Proclus, and Simplicius, writing centuries after his lifetime. These sources mix philosophical reconstruction, anecdote, and doxography. Aristotle cites Thales as an early inquirer into nature and as a proponent of a single underlying principle; Herodotus connects Thales to events in Lydia and Media; later biographical traditions attribute mathematical and practical feats to him. Because these reports are secondhand, modern accounts distinguish between what is likely, what is plausible, and what is legendary.

Intellectual Milieu and Associates
Miletus fostered a cluster of inquirers later grouped as the Milesian school. Anaximander is often described as a younger associate or pupil of Thales, and Anaximenes as a successor to Anaximander. Whether these relationships were strictly pedagogical is uncertain, but the three are linked by shared attention to the origins and structure of the natural world. Beyond Ionia, Thales was connected in later memory to other prominent Greeks: Solon, another of the Seven Sages, is a touchstone for comparisons in wisdom; and Lydian rulers such as Alyattes and Croesus appear in narratives where Thales offers counsel or technical aid.

Natural Philosophy
Aristotle reports that Thales proposed water as the arche, the fundamental principle of all things. Aristotle conjectures that Thales inferred this from observations that life depends on moisture, that seeds are moist, and that the earth might rest on water. However interpreted, the claim signaled a shift from mythic genealogies of gods to a natural, unifying explanation. Later sources also attribute to Thales the aphorism that all things are full of gods, and the idea that magnets have soul because they cause motion. These statements, whatever their exact wording, suggest an attempt to account for motion and life in the world without recourse to traditional mythology, while still acknowledging animacy in nature.

Mathematics and Geometry
Thales is credited by later mathematical commentators, especially Proclus, with early steps in deductive geometry. Attributions include: that a circle is bisected by its diameter; that the base angles of an isosceles triangle are equal; that vertical angles are equal; that the angle in a semicircle is a right angle; and that similar triangles can be used to measure inaccessible distances. Anecdotes describe him measuring the height of pyramids by comparing their shadows when his own shadow equaled his height. Whether Thales proved these results as Euclid would later do cannot be verified, but the tradition views him as moving geometry from rule-of-thumb practice toward reasoned demonstration.

Astronomy and the Eclipse
Herodotus recounts that Thales predicted a solar eclipse that occurred during a battle between the Lydians under Alyattes and the Medes under Cyaxares, commonly identified with the eclipse of 585 BCE. How such a prediction would have been made is unknown; some modern scholars suggest that Babylonian eclipse cycles might have been known in Ionia, but there is no direct evidence for Thales' method. Even so, the report presents him as a figure who sought natural, calculable patterns in celestial phenomena. Other traditions ascribe to Thales the introduction of the Little Bear (Ursa Minor) as a navigational aid and the use of the gnomon to mark solstices, though these innovations are also credited to Anaximander. The cluster of stories points to an Ionian effort to track regularities in the heavens.

Practical Wisdom and Public Counsel
Aristotle relates a story that Thales, criticized for poverty, used astronomical foresight to lease olive presses before a bumper harvest, then profited by renting them out, illustrating that a philosopher could acquire wealth if he wished. Herodotus also reports that Thales helped Croesus cross the Halys River by advising the diversion of its flow into channels, a feat of practical engineering. Another tradition has Thales encouraging the Ionian cities to form a common council at Teos to strengthen their position. Whether or not these accounts are precise, they exhibit the image of Thales as a counselor whose knowledge could be applied to civic and strategic problems.

Character and Anecdote
The later literary portrait of Thales balances seriousness with irony. Plato tells the tale of a Thracian servant girl who laughs when Thales, gazing at the stars, falls into a well, a parable on the philosopher's otherworldliness. Diogenes Laertius preserves sayings attributed to him on moderation and self-knowledge. Such stories do not establish facts about his personality, but they reveal how later Greeks imagined the earliest philosopher: curious, practical when needed, and sometimes comically absorbed in inquiry.

Influence on Anaximander and Anaximenes
Anaximander departed from the water hypothesis and posited the boundless (apeiron) as the origin of things, while Anaximenes chose air. Even if the exact lines of influence are uncertain, the sequence of proposals shows how Thales' move to a single, natural principle opened a program of competing yet related accounts. Aristotle, reflecting on these thinkers, treats them collectively as launching the search for material causes, a framework that would organize philosophy and science for centuries.

Reception and Legacy
Because his own writings, if any, did not survive, Thales' legacy is less a set of texts than a pattern of inquiry. Aristotle places him at the beginning of natural philosophy; Herodotus places him amid great events; mathematical commentators place him at the start of proof-based geometry. Later Hellenistic and Roman authors consolidate his status as a founder figure. Whether or not he truly discovered each theorem or made each prediction, the cumulative record shows that the early Greek tradition remembered him as the first to ask what the world is made of, to argue that a single principle could explain diverse phenomena, and to apply observation and reasoning to problems in nature and society.

Death and Chronology
Ancient chronologies generally place Thales' death in the mid-sixth century BCE, sometimes with the anecdote that he died of heat or exhaustion while watching athletic games, a story preserved by Diogenes Laertius. The dates, like many details of his life, are approximate. Still, the broad outline is consistent: a lifetime straddling the early flowering of Ionian inquiry, formative for the generations that followed, including Anaximander, Anaximenes, and eventually, through the reflections of Plato and Aristotle, the entire subsequent course of Western philosophy and science.

Our collection contains 3 quotes who is written by Thales, under the main topics: Wisdom - Hope.

Other people realated to Thales: Anaxagoras (Philosopher), Anacharsis (Philosopher)

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