“The learning of the gentleman enters through his ears, fastens to his heart, spreads through his four limbs, and manifests itself in his actions. … The learning of the petty person enters through his ears and passes out his mouth. From mouth to ears is only four inches—how could it be enough to improve a whole body much larger than that?”
Readings in Classical Chinese Philosophy (2001), p. 259
An Exhortation to Learning
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Xun Zi 13
Ancient Chinese philosopher -313–-238 BCRelated quotes

“Measure a man by his actions fully, through his whole life, from the beginning to the end.”
Posthumous attributions, Tupac: Resurrection (2003)

“A scholar … should turn his ears from the talk of the illiterate and not take it to heart.”
Treatise 3: “The Study of the Torah,” H. Russell, trans. (1983), p. 69
Mishneh Torah (c. 1180)

“The heart of a fool is in his mouth, but the mouth of a wise man is in his heart.”

in Quotable Patri http://patrifriedman.com/quotes/patri.html
Variant: If you want to communicate an idea to a man's brain, talk to him through his pecker. It's like an ear horn, y'all.
Source: Lothaire

Sein Blick ist vom Vorübergehen der Stäbe
so müd geworden, daß er nichts mehr hält.
Ihm ist, als ob es tausend Stäbe gäbe
und hinter tausend Stäben keine Welt.<p>Der weiche Gang geschmeidig starker Schritte,
der sich im allerkleinsten Kreise dreht,
ist wie ein Tanz von Kraft um eine Mitte,
in der betäubt ein großer Wille steht.<p>Nur manchmal schiebt der Vorhang der Pupille
sich lautlos auf—. Dann geht ein Bild hinein,
geht durch der Glieder angespannte Stille—
und hört im Herzen auf zu sein.
As translated by Albert Ernest Flemming
Der Panther (The Panther) (1907)