To be even-minded is the greatest virtue.

Heraclitus, Fragments

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Where this comes from

What remains of Heraclitus, preserved in quotation by later writers.

Heraclitus. A pre-Socratic philosopher from Ephesus, writing around 500 BCE, whose work survives only as fragments. He was not a Stoic — he predates the school — but his account of constant change and of the logos was taken up directly by it.