The idea that there is a single underlying order to the universe.
This was the first great debate. Heraclitus argued that the universe is defined by change ("You cannot step into the same river twice"). Parmenides countered that change is an illusion and that "Being" is uniform and permanent. 2. Interpretation: Why This Matters
As the "Natural Philosophy" of the Milesians matured, the focus eventually shifted from the stars to the streets. The began teaching rhetoric and relativism, which paved the way for Socrates . Socrates moved the goalposts from "What is the world made of?" to "How should I live?" and "What is justice?"
The Birth of Reason: Interpreting the Dawn of Western Philosophy
They introduced three core concepts that still drive us today:
