Psalms 138:5

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.

Yea, they shall sing in the ways of the LORD. Here is a double wonder —kings in God's ways, and kings singing there. Let a man once know the ways of Jehovah, and he will find therein abundant reason for song; but the difficulty is to bring the great ones of the earth into ways so little attractive to the carnal mind. Perhaps when the Lord sends us a King David to preach, we shall yet see monarchs converted and hear their voices raised in devout adoration. For great is the glory of the LORD. This glory shall overshadow all the greatness and glory of all kings: they shall be stirred by a sight of it to obey and adore. O that Jehovah's glory were revealed even now! O that the blind eyes of men could once behold it, then their hearts would be subdued to joyful reverence. David, under a sense of Jehovah's glory, exclaimed, "I will sing" (Ps 138:1), and here he represents the kings as doing the same thing.