Proverbs 17:27–28

Even a fool who keeps quiet is thought wise

27Whoever holds back his sayings knows knowledge, and one cool of spirit is a man of insight.

28Even a fool who keeps silent is considered wise; whoever shuts his lips, discerning.

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In its context

25A senseless son is vexation to his father and bitterness to the one who bore him.

26Also, to fine the righteous is not good, or to strike nobles for their uprightness.

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Read all of Proverbs 17

Its words in the original

The Tongue