Passage cross-references.

But sanctify the Lord God in your hearts: and be ready always to give an answer to every man that asketh you a reason of the hope that is in you with meekness and fear:

A fool uttereth all his mind: but a wise man keepeth it in till afterwards.

The tongue of the wise useth knowledge aright: but the mouth of fools poureth out foolishness.

Be not rash with thy mouth, and let not thine heart be hasty to utter any thing before God: for God is in heaven, and thou upon earth: therefore let thy words be few.

And the tongue is a fire, a world of iniquity: so is the tongue among our members, that it defileth the whole body, and setteth on fire the course of nature; and it is set on fire of hell. …

In the multitude of words there wanteth not sin: but he that refraineth his lips is wise.

Every prudent man dealeth with knowledge: but a fool layeth open his folly.

The heart of the wise teacheth his mouth, and addeth learning to his lips.

Seest thou a man that is hasty in his words? there is more hope of a fool than of him.

Suffer not thy mouth to cause thy flesh to sin; neither say thou before the angel, that it was an error: wherefore should God be angry at thy voice, and destroy the work of thine hands?

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

O generation of vipers, how can ye, being evil, speak good things? for out of the abundance of the heart the mouth speaketh.

For there are many unruly and vain talkers and deceivers, specially they of the circumcision: …

Then said the king, The one saith, This is my son that liveth, and thy son is the dead: and the other saith, Nay; but thy son is the dead, and my son is the living. …

For when they speak great swelling words of vanity, they allure through the lusts of the flesh, through much wantonness, those that were clean escaped from them who live in error.