Heraclitus of Ephesus (ca. 535 – 475 BCE)
A Pre-Socratic Ionian philosopher, a native of Ephesus on the coast of Asia Minor (today’s coast of Turkey) – Heraclitus is recognised as one of the earliest dialectical philosophers with his acknowledgment of the universality of change, and development through internal contradictions. He is famous for (allegedly) expressing the notion that no man can enter the same river twice: “We both step and do not step in the same rivers. We are and are not.” Emphasising that the true nature of everything is continual change itself – everything is in ‘flux’. Heraclitus was the first person in the Western world to create a robust philosophical system. His writings influenced the thought of Socrates, Plato, Aristotle and the modern process philosophy.