Mark 7:21 lists evil that comes from within — demonstrating how the heart's content defines a person, paralleling Proverbs 27:19.

James 1:22-25 uses the mirror metaphor for God's word revealing our true selves — parallel to Proverbs 27:19's water reflecting the heart.

Genesis 6:5 describes the heart's evil intentions — illustrating the principle that the heart reveals the person, as in Proverbs 27:19.

Psalm 33:15 affirms God fashions and observes hearts — echoing the truth that the heart reveals the person from Proverbs 27:19.