A wholesome tongue is a tree of life; a tongue that brings healing, that soothes by its words. Septuagint, "the healing of the tongue." But the Vulgate rendering is better, lingua placabilis, "the gentle, mild tongue" (see on Proverbs 14:30). Speech from such a source refreshes and vivifies all who come under its influence, like the wholesome fruit of a prolific tree (comp. Proverbs 3:18; Proverbs 11:30).
ψυχῆς νοσούσης ἐστὶ φάρμακον λόγος
"The sick soul by a healing word is cured."
But perverseness therein—in the tongue—is a breach in the spirit. The perverseness intended must be falsehood, perversion of the truth. This is ruin and vexation (Isaiah 65:14, where the same word is used) in the spirit, both in the liar himself, whose higher nature is thus terribly marred and spoiled, and in the case of his neighbour, who is injured by his slander and falsehood to the, very core. The LXX; with a different reading, translates, "But he who keepeth it [the tongue] shall be filled with the spirit."