1. As it is written (21-23)
Josiah returned to Jerusalem from his idol-smashing crusade and ordered the people to celebrate the Passover. He did this in order to obey the written word of God. It was the most joyful and lavish celebration in all Israel's history. Josiah remembered God's grace of deliverance, and he wanted his people to remember and restore their broken covenant relationship with God.
2. With all his heart (24-30)
Josiah continued his purge of idolatry, seeking with all his heart to follow the word of God, the Book which Hilkiah had discovered in the temple. He tried with all his heart and strength to obey God's word. But it was too late. Idolatry and immorality had corroded the moral fiber of the nation, and God's decision was firm. Only a remnant would be spared. Josiah was mercifully killed in battle (22:20; 23:29).