18 There is one who speaks rashly like the piercing of a sword,
but the tongue of the wise heals.

Matthew Henry's Commentary on Proverbs 12:18

Commentary on Proverbs 12:18

(Read Proverbs 12:18)

Whisperings and evil surmises, like a sword, separate those that have been dear to each other. The tongue of the wise is health, making all whole.