Joab Sets the Gold Crown on David's Headby emmanuel_higgins

Psalms 21:5

His glory is great in thy salvation: honour and majesty hast thou laid upon him.

The king's glory is great through God's salvation, and the honor and majesty upon him have been laid there by God himself. His greatness comes in what God has done to save him, and the dignity that crowns him is God's own bestowal.

This is fulfilled in the Father's answer to Christ's prayer in the days of His mortal flesh. In Gethsemane He prayed with strong crying and tears to the One who was able to save Him from death, and He was heard for His godly fear. The answer was life given from the dead, raising Him to die no more with death having no more dominion over Him. That resurrection exaltation to endless life is the great glory in God's salvation, and the honour and majesty laid upon Him.