Psalms 21:3-7

Verse 3

Thou preventest him - To prevent, from prcevenio, literally signifies to go before. Hence that prayer in the communion service of our public Liturgy, "Prevent us, O Lord, in all our doings, with thy most gracious favor!" That is, "Go before us in thy mercy, make our way plain, and enable us to perform what is right in thy sight!" And this sense of prevent is a literal version of the original word תקדמנו tekademennu. "For thou shalt go before him with the blessings of goodness."

Our ancestors used God before in this sense. So in Henry V.'s speech to the French herald previously to the battle of Agincourt: - "Go therefore; tell thy master, here I am.

My ransom is this frail and worthless trunk;

My army, but a weak and sickly guard:

Yet, God before, tell him we will come on,

Though France himself, and such another neighbor,

Stand in our way."

A crown of pure gold - Probably alluding to the crown of the king of Rabbah, which, on the taking of the city, David took and put on his own head. See the history, 2Sam 12:26-30 (note).
Verse 4

He asked life of thee - This verse has caused some interpreters to understand the Psalm of Hezekiah's sickness, recovery, and the promised addition to his life of fifteen years; but it may be more literally understood of the Messiah, of whom David was the type, and in several respects the representative.
Verse 5

His glory is great - But great as his glory was, it had its greatness from God's salvation. There is no true nobility but of the soul, and the soul has none but what it receives from the grace and salvation of God.
Verse 6

Thou hast made him most blessed for ever - Literally, "Thou hast set him for blessings for ever." Thou hast made the Messiah the Source whence all blessings for time and for eternity shall be derived. He is the Mediator between God and man.

Thou hast made him exceeding glad - Jesus, as Messiah, for the joy that was set before him, of redeeming a lost world by his death, endured the cross, and despised the shame, and is for ever set down on the right hand of God.
Verse 7

The king trusteth in the Lord - It was not by my skill or valor that I have gained this victory, but by faith in the strong protecting, and conquering arm of Jehovah.

He shall not be moved - Perhaps this may be best understood of him who was David's prototype. His throne, kingdom, and government, shall remain for ever.
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