1 The king shall joy in thy strength, O LORD; and in thy salvation how greatly shall he rejoice!
We will rejoice in thy salvation, and in the name of our God we will set up our banners: the LORD fulfil all thy petitions. Now know I that the LORD saveth his anointed; he will hear him from his holy heaven with the saving strength of his right hand.
But I will sing of thy power; yea, I will sing aloud of thy mercy in the morning: for thou hast been my defence and refuge in the day of my trouble. Unto thee, O my strength, will I sing: for God is my defence, and the God of my mercy.
For unto us a child is born, unto us a son is given: and the government shall be upon his shoulder: and his name shall be called Wonderful, Counsellor, The mighty God, The everlasting Father, The Prince of Peace. Of the increase of his government and peace there shall be no end, upon the throne of David, and upon his kingdom, to order it, and to establish it with judgment and with justice from henceforth even for ever. The zeal of the LORD of hosts will perform this.
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Commentary on Psalms 21 Matthew Henry Commentary
Psalm 21
As the foregoing psalm was a prayer for the king that God would protect and prosper him, so this is a thanksgiving for the success God had blessed him with. Those whom we have prayed for we ought to give thanks for, and particularly for kings, in whose prosperity we share. They are here taught,
In this there is an eye to Messiah the Prince, and the glory of his kingdom; for to him divers passages in this psalm are more applicable than to David himself.
To the chief musician. A psalm of David.
Psa 21:1-6
David here speaks for himself in the first place, professing that his joy was in God's strength and in his salvation, and not in the strength or success of his armies. He also directs his subjects herein to rejoice with him, and to give God all the glory of the victories he had obtained; and all with an eye to Christ, of whose triumphs over the powers of darkness David's victories were but shadows.
In singing this we should rejoice in his joy and triumph in his exaltation.
Psa 21:7-13
The psalmist, having taught his people to look back with joy and praise on what God had done for him and them, here teaches them to look forward with faith, and hope, and prayer, upon what God would further do for them: The king rejoices in God (v. 1), and therefore we will be thankful; the king trusteth in God (v. 7), therefore will we be encouraged. The joy and confidence of Christ our King is the ground of all our joy and confidence.