The Keyword

"words of a man's mouth are deep waters"

Proverbs 18:4
"4 The words of a man's mouth are deep waters; The wellspring of wisdom is a flowing brook."   (Whole Chapter of NKJ Version)

"4 The words of a [discreet and wise] man's mouth are like deep waters [plenteous and difficult to fathom], and the fountain of skillful and godly Wisdom is like a gushing stream [sparkling, fresh, pure, and life-giving]."   (Whole Chapter of Amp Version)