Proverbs 9:9 in the World English Bible
Instruct a wise person, and he will be still wiser. Teach a righteous person, and he will increase in learning.
Context
8 Reprove not a scorner, lest he hate thee: rebuke a wise man, and he will love thee.
9 Give instruction to a wise man, and he will be yet wiser: teach a just man, and he will increase in learning.
10 The fear of the LORD is the beginning of wisdom: and the knowledge of the holy is understanding.