Xenocrates, Greek Philosopher
One of Plato's pupils and successors, who was reputed to be a poor, but very well-spoken man. He spoke so well, it was said, that a drunk young man, Polemon, was so impressed by Xenocrates speaches that he immediately became sober for the rest of his life, started studying under the philosopher and eventually became his successor as headmaster of the Academy.
Xenocrates divided philosophy into logic, physics and ethics and is also credited with having made the first attempt to separate mind, body and soul. He stated that reality is a combination of perception, knowledge and opinion.
"I have often regreted my speech, never my silence."
"I have often repented speaking, but never of holding my tongue. "