Zeno of Citium was a Greek philosopher who founded the Stoic school of philosophy in the early 3rd century BCE. He is known for teaching that virtue is based on knowledge and that the wise live in harmony with the divine reason, or 'logos', which governs the universe. Zeno's ideas laid the groundwork for Stoicism, which became one of the most influential schools of thought during the Hellenistic and Roman periods, promoting ideas about ethics, logic, and the nature of reality.
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