Zeno of Sidon (; c. 150 – c. 75 BC) was a Greek Epicurean philosopher from the Seleucid city of Sidon. His writings have not survived, but there are some epitomes of his lectures preserved among the writings of his pupil Philodemus.
Life Zeno was born in the city of Sidon. He was a contemporary of Cicero, who heard him when at Athens.Cicero, de Natura Deorum, i. 59 .Cicero, Tusculan Disputations, iii. 17.
He was sometimes termed the "leading Epicurean." () Cicero states that Zeno was contemptuous of other philosophers, and even called Socrates "the Attic Buffoon (scurram Atticum)."Cicero, de Natura Deorum, i. 93. He was a disciple of Apollodorus, and Cicero and Diogenes Laërtius both describe him as an accurate and polished thinker.
Philosophy Zeno held that happiness is not merely dependent upon present enjoyment and prosperity, but also on a reasonable expectation of their continuance and appreciation.
Zeno's writings have not survived, but among the charred papyrus remains at the Villa of the Papyri at Herculaneum, there is an Epitome of Conduct and Character from the Lectures of Zeno written by his pupil Philodemus. It contains the essays On Frank CriticismPHerc. 1471 and On Anger.PHerc. 182
Zeno also studied the philosophy of mathematics based on the derivation of all knowledge from experience. He criticized Euclid, seeking to show that deductions from the fundamental principles () of geometry cannot, on their own, be proved:
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