Heraclitus

“From Lives and Opinions of Eminent Philosophers by Diogenes Laërtius, Book IX, section 8”

“τὴν μεταβολὴν ὁδὸν ἄνω κάτω, τόν τε κόσμον γίνεσθαι κατ' αὐτήν. Change he called a pathway up and down, and this determines the birth of the world.”

“As quoted by Aristotle in Nicomachean Ethics , Book II”

“χαλεπώτερον ἡδονῇ μάχεσθαι ἢ θυμῷ It is harder to fight against pleasure than against anger.”

“As quoted in Plato, Cratylus , 402a”

“δὶς ἐς τὸν αὐτὸν ποταμὸν οὐκ ἂν ἐμβαίης. You could not step twice into the same river.”

“As quoted by Plato in Cratylus , 402a”

“πάντα χωρεῖ καὶ οὐδὲν μένει Everything changes and nothing stands still.”

“As quoted by Plato in Cratylus , 401d”

“τὰ ὄντα ἰέναι τε πάντα καὶ μένειν οὐδέν All entities move and nothing remains still.”