Heraclitus, the pre-Socratic philosopher, left us to interpret and apply his often-cryptic aphorisms. One of the fragments that survives from his writing declares, “All is flux, nothing stays still”, a phrase that Plato quoted in the Cratylus. Who could think otherwise? Everything, of course, changes, which is why you can’t step into the same river twice, another thought attributed to Heraclitus: it’s not just that the water in the river flows by so the river is different, but that you...
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