Proverbs 15:4 - Matthew Poole's English Annotations on the Holy Bible

A wholesome tongue, which uttereth sound, and comfortable, and useful counsels, is a tree of life; is greatly useful to preserve the present life, and to promote the spiritual and eternal life, both of the speaker and hearers. Perverseness therein, all sorts of false or corrupt speeches, is a breach in the spirit; disturbs and wounds, and ofttimes corrupts and destroys, the spirits or souls, both of the speaker and hearers.