Speak not in the ears of a fool: for he will despise the wisdom of thy words.
Proverbs 23:9
King James Version (public domain)
Traditionally attributed to Solomon · c. 10th century BC · King of Israel, renowned for wisdom
Context
7For as he thinketh in his heart, so is he: Eat and drink, saith he to thee; but his heart is not with thee.
8The morsel which thou hast eaten shalt thou vomit up, and lose thy sweet words.
9Speak not in the ears of a fool: for he will despise the wisdom of thy words.
10Remove not the old landmark; and enter not into the fields of the fatherless:
11For their redeemer is mighty; he shall plead their cause with thee.