John Gills Exposition of the Bible Commentary - Proverbs 15:4
A wholesome tongue is a tree of life ,.... A tongue that delivers out salutary instructions, wholesome advice and counsel; a "healing tongue" F23 מרפא "sanans", so some in Vatablus. , as it may be rendered, which pacifies contending parties, and heals the divisions between them; to have the benefit of such a man's company and conversation is like being in paradise. Such is the tongue of a Gospel minister, which delivers out the wholesome words of our Lord Jesus Christ; sound speech... read more
Matthew Henry's Complete Commentary - Proverbs 15:4
Note, 1. A good tongue is healing, healing to wounded consciences by comforting them, to sin-sick souls by convincing them, to peace and love when it is broken by accommodating differences, compromising matters in variance, and reconciling parties at variance; this is the healing of the tongue, which is a tree of life, the leaves of which have a sanative virtue, Rev. 22:2. He that knows how to discourse will make the place he lives in a paradise. 2. An evil tongue is wounding (perverseness,... read more