Proverbs 12:23

A prudent man keeps his knowledge, but the hearts of fools proclaim foolishness.

Proverbs 13:16

Every prudent man acts from knowledge, but a fool exposes folly.

Proverbs 15:2

The tongue of the wise commends knowledge, but the mouth of fools gush out folly.

Proverbs 11:13

One who brings gossip betrays a confidence, but one who is of a trustworthy spirit is one who keeps a secret.

Proverbs 10:14

Wise men lay up knowledge, but the mouth of the foolish is near ruin.

Proverbs 10:19

In the multitude of words there is no lack of disobedience, but he who restrains his lips does wisely.

Ecclesiastes 10:3

Yes 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 a fool is swallowed by his own lips.

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
In the multitude of words there is no lack of disobedience, but he who restrains his lips does wisely.
Proverbs 11:13
One who brings gossip betrays a confidence, but one who is of a trustworthy spirit is one who keeps a secret.
Proverbs 13:16
Every prudent man acts from knowledge, but a fool exposes folly.

But

Proverbs 15:2
The tongue of the wise commends knowledge, but the mouth of fools gush out folly.
Ecclesiastes 10:3
Yes 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 one who has understanding, and is even made known in the inward part of fools.
Proverbs 29:11
A fool vents all of his anger, but a wise man brings himself under control.