Verse 22. Joyful - He had given them both cause to rejoice, and hearts to rejoice. God is the fountain whence all the streams of true joy flow. Of Assyria - Of the king of Persia, who was now king of Assyria also, here so called emphatically, to note the great power and goodness of God in turning the hearts of these great monarchs, whose predecessors had been the chief persecutors and oppressors of God's people.