♠Heraclitus of Ephesus:

“The Doctrine of Flux and the Unity of Opposites”:

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The central idea of Heraclitus’ thought is undoubtedly the unity of opposites. Moreover, Heraclitus claimed that all things are one. This ‘unity of all things’ is based on the fact that there is a common formula, i.e. logos, which is at work in everything to which we attribute temporal and spatial identity and continuity. Heraclitus should not be misunderstood as denying the phenomenal difference between day and night, hot and cold, up and down, and even death and life, rather, his claim is that each opposite is inseparable from its other, and that they depend on one another for their own identity. In other words, if one of the pair is removed the other immediately disappears.

Heraclitus’ famous phrase that “you can’t step in the same river twice” should be understood as the claim that things…