The hearts of the wise make their mouths prudent, and their lips promote instruction.
Read Proverbs 16:23 Using Other Translations
The heart of the wise teacheth his mouth, and addeth learning to his lips.
The heart of the wise makes his speech judicious and adds persuasiveness to his lips.
From a wise mind comes wise speech; the words of the wise are persuasive.
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(New International Version Bible Online)