Proverbs 12:23

A clever person conceals knowledge, but the heart of a fool announces folly.

Proverbs 13:16

Anyone who is clever will act with intelligence, but the fool will display folly.

Proverbs 15:2

The tongue of the wise will dispense knowledge, but the mouth of fools will pour out folly.

Proverbs 11:13

A gossip walks [about] telling a secret, but the trustworthy in spirit keeps [the] matter.

Proverbs 10:14

Those who are wise lay up knowledge, but [to] the mouth of the fool, ruin draws near.

Proverbs 10:19

In many words, transgression is not lacking, but he who restrains his lips is prudent.

Ecclesiastes 10:3

Even when the fool walks along the road, he lacks sense; he tells everyone [that] he is a fool.

Ecclesiastes 10:12-14

The wise man [wins] favor by the words of his mouth, but the fool is devoured 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 many words, transgression is not lacking, but he who restrains his lips is prudent.
Proverbs 11:13
A gossip walks [about] telling a secret, but the trustworthy in spirit keeps [the] matter.
Proverbs 13:16
Anyone who is clever will act with intelligence, but the fool will display folly.

But

Proverbs 15:2
The tongue of the wise will dispense knowledge, but the mouth of fools will pour out folly.
Ecclesiastes 10:3
Even when the fool walks along the road, he lacks sense; he tells everyone [that] he is a fool.

General references

Proverbs 14:33
In the heart of him who has understanding, wisdom rests, but [even] in the midst of fools it becomes known.
Proverbs 29:11
A fool gives all his breath, but [the] wise holds back in quiet.