Philosophical dialogue · Philosophical literatureMan is the measure of all things.ProtagorasPlato, Theaetetus · 420 BC★ 9.4
Historical literatureIn truth we know nothing, for truth lies in the depth.DemocritusDiogenes Laertius, The Lives and Opinions of Eminent Philosophers · 240★ 3.9
Presocratic fragment · Fragment · Philosophical literatureThe animal needing something knows how much it needs, the man does not.Democritus370 BC★ 3.8
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