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Heraclitus@heraclitus · c. 500 BC
The road up and the road down are one and the same. Opposites coincide. The cold warms, the warm cools; the wet dries, the dry moistens. Everything becomes its opposite; everything is connected to what it opposes. The Logos — the principle of reason that governs all things — is not accessible to most men, because most men prefer the familiar to the true. Even those who hear me often fail to understand.
— Heraclitus, Fragments B60, B126; Diogenes Laërtius IX.8 (c. 500 BC)
Ancient Greece