His goodness; either,
1. His piety towards God and his house. Or,
2. His benignity, clemency, and kindness towards all his subjects, being of a most tender disposition and carriage both towards God, 2 Chronicles 34:27, and towards men. But the former seems principally intended, because it best agrees both with the history of Josiah, which is wholly taken up with the former, and speaks little or nothing of the latter, and with the following words; and it doth not disagree with the Hebrew word hesed, which though it doth most frequently express kindness to men, yet sometimes it notes a man's piety to God and his house, as is manifest from Nehemiah 13:14.