Knowra Heraclitus Heraclitus Heraclitus was an ancient Greek philosopher from Ephesus, active around 500 BCE. His surviving fragments explore change, the unity of opposites, and the logos, an ordering principle he said people often fail to recognize.
Logos : A Greek term for speech, account, or reason, used by Heraclitus for an ordering principle shared by the world. Heraclitus makes the logos central to the order that persists amid change.
Ephesus : An ancient Greek city on the coast of Ionia in western Anatolia. Heraclitus came from Ephesus, a prominent city in the Greek world.
Plato : An ancient Greek philosopher whose dialogues address knowledge, ethics, politics, and reality. Plato’s dialogues associate Heraclitus with the view that sensible things are always changing.
Heraclitus and Plato : A topic in ancient philosophy concerning Plato’s interpretation of Heraclitean change and its limits. Plato’s reception helped make Heraclitus a defining figure in debates about sensible change.
Unity of opposites : The idea that opposed conditions or forces can be interdependent aspects of a unified reality. Heraclitus treats tensions such as waking and sleeping as mutually defining.
Ionia : The ancient Greek-inhabited region along the western coast of Anatolia. Ephesus lay in Ionia, where early Greek natural philosophy took shape.
Aristotle : An ancient Greek philosopher whose works range across logic, nature, ethics, and politics. Aristotle reports and criticizes Heraclitean claims, especially about contradiction and change.
Heracliteanism : A family of interpretations that emphasizes change, opposition, or the logos in Heraclitus’s thought. Later traditions use this label for positions they connect to his surviving sayings.
Flux : Continuous change or movement, especially the view that reality is never wholly static. Heraclitus’s river image became the classic expression of a world in motion.
Heraclitean fragments : The surviving quotations and testimonia attributed to Heraclitus, preserved by later ancient authors. His thought survives chiefly as brief, often enigmatic passages rather than a complete book.
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