Proverbs 10:11

The mouth of the righteous is a fountain of life,
but the mouth of the wicked conceals violence.

Blessings are on the head of the righteous,
but the mouth of the wicked conceals violence.

A wise man’s instruction is a fountain of life,
turning people away from the snares of death.

The words of a man’s mouth are deep waters,
a flowing river, a fountain of wisdom.

The mouth of the righteous utters wisdom;
his tongue speaks what is just.

The upright see it and rejoice,
and all injustice shuts its mouth.

The tongue of the righteous is pure silver;
the heart of the wicked is of little value.

The lips of the righteous know what is appropriate,
but the mouth of the wicked, only what is perverse.

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The lips of the wise broadcast knowledge,
but not so the heart of fools.

Insight is a fountain of life for its possessor,
but the discipline of fools is folly.

There is gold and a multitude of jewels,
but knowledgeable lips are a rare treasure.

The words from the mouth of a wise man are gracious,
but the lips of a fool consume him.

Brood of vipers! How can you speak good things when you are evil? For the mouth speaks from the overflow of the heart.

No foul language is to come from your mouth, but only what is good for building up someone in need, so that it gives grace to those who hear.

So too, though the tongue is a small part of the body, it boasts great things. Consider how large a forest a small fire ignites.

Treasury of Scripture Knowledge

The mouth of a righteous man is a well of life: but violence covereth the mouth of the wicked.