In existographies, Xenocrates (396-314BC) (ACR:30) (CR:5) was a Greek philosopher and mathematician, student of Plato, associate of Aristotle, head of the Platonic Academy from c.338 to 313BC, purported teacher of Epicurus, noted for []

Overview
Xenocrates believed that matter is composed of individual units, according to which some attribute him as being an early proponent of atomic theory, in some sense. He also believed in humans having threefold existence, mind, body and soul; also that people die twice, once on earth, then for a second time on the moon when the mind separates from the soul and travels to the sun. (Ѻ)

Quotes | On
The following are quotes on Xenocrates:

“Apollodorus in his Chronology tells us that our philosopher was a pupil of Nausiphanes and Praxiphanes; but in his letter to Eurylochus, Epicurus himself denies it and says that he was self-taught. Both Epicurus and Hermarchus deny the very existence of Leucippus the philosopher, though by some and by Apollodorus the Epicurean he is said to have been the teacher of Democritus. Demetrius the Magnesian affirms that Epicurus also attended the lectures of Xenocrates.”
Diogenes Laertius (c.230), Lives and Opinions of Eminent Philosophers (§10.12)

External links
Xenocrates – Wikipedia.

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