A wholesome tongue is a tree of life - Here again is an allusion to the paradisiacal tree, חיים עץ ets chaiyim, "the tree of lives."
A wholesome tongue - literally, as in the margin, the same word as “sound” in Proverbs 14:30 (see the note). A more literal rendering would be soundness of speech.
Tree of life - Compare Proverbs 3:18 note.
Breach in the spirit - With the sense of vexation (compare Isaiah 65:14).