⁹ Instruct the wise and they will be wiser still;
    teach the righteous and they will add to their learning.^(A)

²¹ The wise in heart are called discerning,
    and gracious words promote instruction.^[a](A)

²³ The hearts of the wise make their mouths prudent,^(A)
    and their lips promote instruction.^[a](B)