Proverbs 15:4
“A wholesome tongue is a tree of life: but perverseness therein is a breach in the spirit.”
The tongue of the wise useth knowledge aright: but the mouth of fools poureth out foolishness.
The eyes of the Lord are in every place, beholding the evil and the good.
A wholesome tongue is a tree of life: but perverseness therein is a breach in the spirit.
A fool despiseth his father’s instruction: but he that regardeth reproof is prudent.
In the house of the righteous is much treasure: but in the revenues of the wicked is trouble.
Counter-Arguments
The strongest case that this verse does not belong in this theme.

Cross-References
“Let your speech be alway with grace, seasoned with salt, that ye may know how ye ought to answer every man.”
“Pleasant words are as an honeycomb, sweet to the soul, and health to the bones.”
“There is that speaketh like the piercings of a sword: but the tongue of the wise is health.”
“A good man out of the good treasure of the heart bringeth forth good things: and an evil man out of the evil treasure bringeth forth evil things.”
“There is that speaketh like the piercings of a sword: but the tongue of the wise is health.”