New Revised Standard Version
On the lips of one who has understanding wisdom is found, but a rod is for the back of one who lacks sense.

Contemporary English Version
If you have good sense, it will show when you speak. But if you are stupid, you will be beaten with a stick.

New American Bible
On the lips of the intelligent is found wisdom, but a rod for the back of one without sense.

Douay-Rheims Bible
Wise men lay up knowledge: but the mouth of the fool is next to confusion.

Wise men lay up knowledge: but the mouth of the fool is next to confusion.

the lips

Proverbs 10:11,21 Hatred stirreth up strifes: and charity covereth all sins. . . .

Proverbs 15:7,23 The lips of the wise shall disperse knowledge: the heart of fools shall be unlike. . . .

Proverbs 20:15 There is gold and a multitude of jewels: but the lips of knowledge are a precious vessel.

Proverbs 26:3 A whip for a horse, and a snaffle for an ass, and a rod for the back of fools.

Exodus 10:12 And the Lord said to Moses: Stretch forth thy hand upon the land of Egypt unto the locust, that it come upon it, and devour every herb that is left after the hail.

Isaiah 50:4 The Lord hath given me a learned tongue, that I should know how to uphold by word him that is weary: he wakeneth in the morning, in the morning he wakeneth my ear, that I may hear him as a master.

Luke 4:22 And all gave testimony to him. And they wondered at the words of grace that proceeded from his mouth. And they said: Is not this the son of Joseph?

a rod

Proverbs 10:10 The mouth of the just is a vein of life: and the mouth of the wicked covereth iniquity.

Proverbs 7:22 Till the arrow pierce his liver: as if a bird should make haste to the snare, and knoweth not that his life is in danger.

Proverbs 17:10 A reproof availeth more with a wise man, than a hundred stripes with a fool.

Proverbs 26:3 A whip for a horse, and a snaffle for an ass, and a rod for the back of fools.

Proverbs 27:22 Though thou shouldst bray a fool in the mortar, as when a pestle striketh upon sodden barley, his folly would not be taken from him.

Psalm 32:9 Do not become like the horse and the mule, who have no understanding. With bit and bridle bind fast their jaws, who come not near unto thee.

understanding

Proverbs 6:32 He gathereth to himself shame and dishonour, and his reproach shall not be blotted out: