Proverbs 16:21 states that sweetness of lips increases learning, directly paralleling the same chapter's teaching on the wise heart.

Proverbs 15:28 shows the righteous heart pondering answers, directly paralleling the wise heart producing prudent speech in 16:23.

Proverbs 22:18 links keeping wisdom in the heart with ready speech, directly echoing the heart-to-lips connection in 16:23.

Proverbs 22:17 calls for hearing wise words and applying the heart, complementing the wise heart's speech in 16:23.

Psalm 37:30 says the righteous mouth utters wisdom, directly paralleling the prudent speech from a wise heart in 16:23.

Psalm 45:1 describes the heart overflowing into eloquent speech, exactly mirroring the wise heart's effect on lips in 16:23.

Matthew 12:34 teaches that speech flows from the heart's abundance, directly supporting the principle in 16:23 of wise heart producing prudent speech.

Matthew 12:35 expands on the same principle: the heart's treasure determines speech, just as the wise heart teaches the mouth.

Job 8:10 explicitly asks about uttering words from the heart, directly echoing the proverb's link between heart and speech.