Trusts in the Lord, rejoice in his strength; Psalm 21

Psalm 21:1-13
Royal thanksgiving
O Lord, the king rejoices in your strength. How great is his joy in the victories you give!
For the king trusts in the Lord; through the unfailing love of the Most High he will not be shaken.
Be exalted, O Lord, in your strength we will sing and praise your might.
God give blessing and splendor and majesty to him, granted him the desire of his heart and have not withheld the request of his lips.
The occasion may be a victory, or an anniversary.
The king counts his blessings, rejoicing in God's goodness. His confidence for the future rests in God's constant love.
With God' help, all his enemies will be put down.
The last verse is the counterpart cheer God to the echo.
Why?
All of the blessing are because the king trusts in the Lord. And the unfailing love of the Most High he will not be shaken, so I won't be shaken either.
How great is the strength of the Lord. Rejoices in his strength.
How?
Trust in the Lord, I won't be shaken.