Sin Engraved on the Heart; Trust Rooted by Water
Judah’s sin is pictured as engraved with an iron pen on the heart, while the chapter contrasts two kinds of trust. Trust in human strength is a desert shrub; trust in the LORD is a tree rooted beside water that remains fruitful in drought. The famous declaration that the heart is deceitful leads to the LORD’s claim that He searches the heart and tests the inward parts.