Heraclitus, pre-Socratic. “The Puzzler.” We are all asleep, wake up and understand the logos (q.v.) which, of course he does not clearly explain. From Ephesus in Asia Minor. Did he meet up with Siddhartha, the Buddha? Well he did believe in an essential principle or or “harmonia‘ to the world. The ever changing reality. Famous for
You can’t step in the same river twice.
Here is some of the discussion on Coursera from Prof Susan S Meyer
Two Strikes 