“Nature gave us one tongue and two ears so we could hear twice as much as we speak.”

As per an article published in the New York Times in 1975, this was King Faisal's favorite quote. https://www.nytimes.com/1975/03/26/archives/faisal-rich-and-powerful-led-saudis-into-20th-century-and-to-arab.html

English Traits, Race
Bartlett's Familiar Quotations, 10th ed. (1919)

The Practice of the Wild (1990)

Source: On the Mystical Body of Christ, pp. 419-420

Book 6, chapter 24.
Books, Coningsby (1844), Henrietta Temple (1837)

As quoted in Diogenes Laërtius Lives and Opinions of Eminent Philosophers, vii. 23.
Variant translation: The reason why we have two ears and only one mouth is that we may listen the more and talk the less.

Foamfollower, Lord Foul's Bane

"Less and Less Human, O Savage Spirit"
Transport to Summer (1947)
Context: p> If there must be a god in the house, must be,
Saying things in the room and on the stair,Let him move as the sunlight moves on the floor,
Or moonlight, silently, as Plato's ghostOr Aristotle's skeleton. Let him hang out
His stars on the wall. He must dwell quietly.He must be incapable of speaking, closed,
As those are: as light, for all its motion, is;As color, even the closest to us, is;
As shapes, though they portend us, are.It is the human that is the alien,
The human that has no cousin in the moon.It is the human that demands his speech
From beasts or from the incommunicable mass.If there must be a god in the house, let him be one
That will not hear us when we speak: a coolnessA vermillioned nothingness, any stick of the mass
Of which we are too distantly a part.</p