Proverbs 9:9

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

Read Proverbs 9:9 Using Other Translations

Give instruction to a wise man, and he will be yet wiser: teach a just man, and he will increase in learning.
Give instruction to a wise man, and he will be still wiser; teach a righteous man, and he will increase in learning.
Instruct the wise, and they will be even wiser. Teach the righteous, and they will learn even more.