Heraclitus

(c. 535–475 BCE) was an ancient Greek philosopher known for his doctrine of constant change. He famously stated that one cannot step into the same river twice, emphasizing the ever-changing nature of reality. Heraclitus believed that conflict and opposition are essential for balance and harmony. His philosophical ideas laid the groundwork for later thinkers and influenced concepts of change and unity. Though much of his work survives only in fragments, his insights continue to shape philosophical discussions. Heraclitus’s legacy remains significant in the study of metaphysics and philosophy.