Proverbs 14:33

In the heart of him who has understanding, wisdom rests, but [even] in the midst of fools it becomes known.

Proverbs 12:16

As for a fool, {on that very day} he makes his anger known, but he who ignores an insult [is] prudent.

Proverbs 29:11

A fool gives all his breath, but [the] wise holds back in quiet.

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 15:28

A heart of righteousness will ponder the answer, but a mouth of wickedness will pour out deceit.

Ecclesiastes 10:3

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

Treasury of Scripture Knowledge

Summary

Wisdom resteth in the heart of him that hath understanding: but that which is in the midst of fools is made known.

Bible References

General references

Proverbs 12:16
As for a fool, {on that very day} he makes his anger known, but he who ignores an insult [is] prudent.
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 29:11
A fool gives all his breath, but [the] wise holds back in quiet.
Ecclesiastes 10:3
Even when the fool walks along the road, he lacks sense; he tells everyone [that] he is a fool.