Proverbs 18:4
The words of a man’s mouth are as deep waters, and the wellspring of wisdom as a flowing brook.
Cross-reference
Proverbs 10:11 uses the same 'fountain' metaphor for righteous speech — a life-giving fountain, deepening the wisdom imagery here.
Proverbs 13:14 calls the wise teaching a fountain of life — directly parallel to the fountain of wisdom in this verse.
Proverbs 16:22 also describes understanding as a fountain of life — reinforcing the image of speech as a source of wisdom and life.
Proverbs 20:5 uses the same 'deep waters' metaphor to show that a wise person can draw out hidden purposes — complementing the image of words as deep waters.
John 7:38 promises rivers of living water from the believer's heart — directly echoing the fountain of wisdom imagery in Proverbs.
John 4:14 promises a spring of water welling up to eternal life — a NT parallel to the fountain of wisdom, now understood as Christ's gift.
John 7:39 reveals that the living water is the Holy Spirit — adding a NT identification to the OT fountain of wisdom.
Psalm 78:2 speaks of uttering dark sayings — similar to the 'deep waters' of Proverbs as hidden wisdom.
Matthew 12:34 teaches that speech flows from the heart's abundance — echoing the idea that words are deep waters from an inner source.
In Matthew 13:52, the scribe brings out treasures old and new — echoing the deep waters and fountain of wisdom, both depicting abundant wisdom.