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 Allusion

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 Allusion

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 Allusion

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 Parallel

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.