Proverbs 15:28

The heart of the righteous studies how to answer. The mouth of the wicked pours out evil things.

1 Peter 3:15

Sanctify the Christ as Lord (kurios: master) in your hearts. Always be ready to answer every man who asks you a reason for your hope, yet with meekness (mildness) and respect!

Proverbs 15:2

The tongue of the wise uses knowledge properly. The mouth of fools pours out foolishness.

1 Kings 3:23-28

King Solomon said: Each of you claims that the living child is hers and that the dead child belongs to the other one.

Proverbs 10:19

Sin does not hide from a multitude of words. The wise controls his lips.

Proverbs 13:16

Every prudent man acts with knowledge. A fool displays his folly.

Proverbs 16:23

The heart of the wise teaches his mouth. It adds learning to his lips.

Proverbs 29:11

A fool loses his temper. But a wise man holds it back.

Proverbs 29:20

See a man quick to talk? There is more hope for a fool then for him.

Ecclesiastes 5:2

Do not be in a hurry to talk. Do not be eager to speak in the presence of God. Since God is in heaven and you are on earth, limit the number of your words.

Ecclesiastes 5:6

Do not let your speech cause you to sin. Do not say to the messenger of God that it was a mistake. Why should God be angry because of what you say and destroy the work of your hands?

Ecclesiastes 10:12-14

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

Matthew 12:34

You offspring of vipers. How can you who are evil speak good things? Out of the abundance of the heart the mouth speaks.

Titus 1:10-11

There are many unruly (rebellious) men, vain talkers, and deceivers, especially those of the circumcision.

James 3:6-8

The tongue is like fire, the place of iniquity among our members. It defiles the whole body, and sets on fire the course of our life. It is set ablaze like the ever-burning fires in the Valley of Hinnom (Greek: Gehenna: symbolic of total destruction).

2 Peter 2:18

For, uttering arrogant words of vanity, they entice in the desires (lusts) of the flesh, by sensuality (lasciviousness), those who are just escaping from the ones who live in error.

Treasury of Scripture Knowledge

Summary

The heart of the righteous studieth to answer: but the mouth of the wicked poureth out evil things.

General references

Bible References

Heart

Proverbs 15:2
The tongue of the wise uses knowledge properly. The mouth of fools pours out foolishness.
Proverbs 16:23
The heart of the wise teaches his mouth. It adds learning to his lips.
1 Kings 3:23
King Solomon said: Each of you claims that the living child is hers and that the dead child belongs to the other one.
Ecclesiastes 5:2
Do not be in a hurry to talk. Do not be eager to speak in the presence of God. Since God is in heaven and you are on earth, limit the number of your words.
1 Peter 3:15
Sanctify the Christ as Lord (kurios: master) in your hearts. Always be ready to answer every man who asks you a reason for your hope, yet with meekness (mildness) and respect!

General references

Proverbs 14:33
Wisdom rests in the heart of the man with understanding. That in the heart of fools is made known.
Matthew 15:18
That which comes out of the mouth, comes from the heart and makes a man unclean.