No man ever steps in the same river twice, for it is not the same river and he is not the same man.
classical · presocratic
Heraclitus
Heraclitus of Ephesus · c. 535–475 BC
The obscure Ephesian: flux, fire, and the river no man steps in twice. A small canon of fragments with a long afterlife.
There is nothing permanent except change.
Character is destiny.
The waking have one common world, but the sleeping turn aside each into a world of his own.
Much learning does not teach understanding.