Antisthenes of Ephesus

Heraclitus was a pre-Socratic Greek philosopher from Ephesus, active around 500 BC. He is renowned for his cryptic and paradoxical teachings on the constant flux of reality, the unity of opposites, and the concept of the logos. His central idea is that the world is in perpetual change, summarized by the phrase 'panta rhei' (everything flows), and that stability arises from the tension and strife between opposing forces. He identified fire as the fundamental element (arche) of the universe, representing this constant transformation. Heraclitus's philosophy, though fragmented and difficult to interpret, profoundly influenced subsequent Western thinkers, including Plato, Aristotle, and the Stoics.