(4, 5) The general sense of these verses is plain, though there are slightly different ways of understanding the expressions. The psalmist imagines that the word or promise, which has been so abundantly fulfilled, will, by its performance, convince all the kings of the earth, and bring them in confession and praise to Jehovah. For a Hebrew the expression "hear the words of Thy mouth," referring in this instance immediately back to Psalm 138:2, was synonymous with "see Thy wonders," since for them "God spoke and it was done."

Verse 4. - All the kings of the earth shall praise thee, O Lord. The world shall be converted to thy worship when it is seen how promptly and fully thou answerest prayer (comp. Psalm 68:31, 32; Psalm 102:15). When they hear the words of thy mouth. The promises that thou makest, and thy performance of them.

138:1-5 When we can praise God with our whole heart, we need not be unwilling for the whole world to witness our gratitude and joy in him. Those who rely on his loving-kindness and truth through Jesus Christ, will ever find him faithful to his word. If he spared not his own Son, how shall he not with him freely give us all things? If God gives us strength in our souls, to bear the burdens, resist the temptations, and to do the duties of an afflicted state, if he strengthens us to keep hold of himself by faith, and to wait with patience for the event, we are bound to be thankful.All the kings of the earth shall praise thee, O Lord,.... Or "let them confess", or "praise thee" (s); a wish or prayer. Not only the kings known to David, as Kimchi limits it; or that lived in his days, as Hiram and others; but in the latter day, when they shall come to Zion, the church, and be nursing fathers to it, and shall serve and worship the King Messiah, Isaiah 49:23;

when they hear the words of thy mouth; either the promises of it fulfilled not only with respect to David; but the Messiah, and his church and people, in the latter day, even the glorious things spoken thereof: or the doctrines of the Gospel, which are the words of his mouth, and more desirable than thousands of gold and silver; and which, when kings shall hear so as to understand, they will praise the Lord for them; see Isaiah 52:15. The Targum is,

"the words of thy praise.''

(s) "confiteantur tibi", V. L. Pagninus, Montanus.