Meditate often on the swiftness with which all that exists and is coming into being is swept by us and carried away. For substance is like a river's unending flow, its activities continually changing and causes infinitely shifting so that almost nothing at all stands still.
— Marcus Aurelius, Meditations, 5.23 (resource) Ryan Holiday, The 366 Meditations on Wisdom, Perseverance, and the Art of Living
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