Proverbs 12:23

A prudent man conceals knowledge, but the heart of fools proclaims foolishness.

Proverbs 13:16

Every prudent man works with knowledge, but a fool flaunts folly.

Proverbs 15:2

The tongue of the wise utters knowledge rightly, but the mouth of fools pours out folly.

Proverbs 11:13

He who goes around as a tale-bearer reveals secrets, but he who is of a faithful spirit conceals a matter.

Proverbs 10:14

Wise men lay up knowledge, but the mouth of a foolish man is a present destruction.

Proverbs 10:19

Transgression is not lacking in the multitude of words, but he who refrains his lips does wisely.

Ecclesiastes 10:3

Yea also, when the fool walks by the way, his understanding fails him, and he says to everyone [that] he is a fool.

Ecclesiastes 10:12-14

The words of a wise man's mouth are gracious, but the lips of a fool will swallow himself up.

Treasury of Scripture Knowledge

Summary

A prudent man concealeth knowledge: but the heart of fools proclaimeth foolishness.

General references

Bible References

A prudent

Proverbs 10:19
Transgression is not lacking in the multitude of words, but he who refrains his lips does wisely.
Proverbs 11:13
He who goes around as a tale-bearer reveals secrets, but he who is of a faithful spirit conceals a matter.
Proverbs 13:16
Every prudent man works with knowledge, but a fool flaunts folly.

But

Proverbs 15:2
The tongue of the wise utters knowledge rightly, but the mouth of fools pours out folly.
Ecclesiastes 10:3
Yea also, when the fool walks by the way, his understanding fails him, and he says to everyone [that] he is a fool.

General references

Proverbs 14:33
Wisdom rests in the heart of him who has understanding, but [a thing] in the inward part of fools is made known.
Proverbs 29:11
A fool utters all his anger, but a wise man keeps it back and calms it.