Proverbs 16:21-23

Revised Standard Version

²¹ The wise of heart is called a man of discernment,
    and pleasant speech increases persuasiveness.
²² Wisdom is a fountain of life to him who has it,
    but folly is the chastisement of fools.
²³ The mind of the wise makes his speech judicious,
    and adds persuasiveness to his lips.