Reference

Proverbs 15:4

A wholesome tongue is a tree of life: but perverseness therein is a breach in the spirit.
2

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

3

The eyes of the Lord are in every place, beholding the evil and the good.

4

A wholesome tongue is a tree of life: but perverseness therein is a breach in the spirit.

5

A fool despiseth his father’s instruction: but he that regardeth reproof is prudent.

6

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.

Conditional Immortality (Hell context)

The verse speaks of a "tree of life" and a "breach in the spirit," which are metaphorical expressions for the positive or negative effects of speech on one's well-being or inner state, not literal statements about eternal life or the cessation of existence for the unsaved.