Psalm 21: Rejoicing in the Strength of the LORD

Core Theme: For when your heart is full — thankful, joyful, and ready to celebrate who God is

Background

David wrote Psalm 21, and the Bible does not name the occasion. It is a royal psalm, sung about the king, and it follows Psalm 20, which is a prayer for the king before battle. Psalm 21 reads as the thanksgiving that comes after: the prayer has been answered, and the king is glad.

What stands out is where David’s joy is rooted. He does not rejoice in his own victories or in the crown on his head. He rejoices in the LORD who gave them. These words also reach beyond David to a greater King, which gives the psalm even more to celebrate.

Psalm 21 (KJV)

1 The king shall joy in thy strength, O LORD; and in thy salvation how greatly shall he rejoice!

2 Thou hast given him his heart’s desire, and hast not withholden the request of his lips. Selah.

3 For thou preventest him with the blessings of goodness: thou settest a crown of pure gold on his head.

4 He asked life of thee, and thou gavest it him, even length of days for ever and ever.

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

6 For thou hast made him most blessed for ever: thou hast made him exceeding glad with thy countenance.

7 For the king trusteth in the LORD, and through the mercy of the most High he shall not be moved.

8 Thine hand shall find out all thine enemies: thy right hand shall find out those that hate thee.

9 Thou shalt make them as a fiery oven in the time of thine anger: the LORD shall swallow them up in his wrath, and the fire shall devour them.

10 Their fruit shalt thou destroy from the earth, and their seed from among the children of men.

11 For they intended evil against thee: they imagined a mischievous device, which they are not able to perform.

12 Therefore shalt thou make them turn their back, when thou shalt make ready thine arrows upon thy strings against the face of them.

13 Be thou exalted, LORD, in thine own strength: so will we sing and praise thy power.

The heart of it

Psalm 21 is what thankfulness looks like after a prayer has been answered. David had asked, and God had given. Now the king is overflowing, and every blessing he lists is traced back to the LORD: the strength, the salvation, the crown, the long life, the gladness.

That is a good pattern for our own thanks. It is easy to enjoy what we have and forget where it came from. David does the opposite. He keeps handing the credit back to God, and that is where his joy comes from. “This is the day which the LORD hath made; we will rejoice and be glad in it” (Psalm 118:24).

The psalm also shows us that a grateful heart is a settled one. David is not anxious about what comes next. He trusts the LORD, and that trust holds him steady.

Walking through it

Verses 1–2: “The king shall joy in thy strength, O LORD; and in thy salvation how greatly shall he rejoice!”

David’s joy is in the LORD’s strength, not his own. And the word “salvation” here means deliverance, the rescue he has just experienced. Verse 2 adds that God has given him his heart’s desire and has not withheld the request of his lips. That is a wonderful thing to remember about prayer: the Lord answers. And when a heart delights in the LORD, its desires are shaped by Him: “Delight thyself also in the LORD; and he shall give thee the desires of thine heart” (Psalm 37:4).

Verse 3: “For thou preventest him with the blessings of goodness: thou settest a crown of pure gold on his head.”

“Preventest” is an old English word that means “goes before.” God met David with blessings before he even asked. Think of how much of what we enjoy came to us that way, unasked and unearned. “Every good gift and every perfect gift is from above, and cometh down from the Father of lights” (James 1:17). The crown of pure gold on David’s head also points ahead to the greater King, of whom it is written: “…and on his head were many crowns” (Revelation 19:12).

Verse 7: “For the king trusteth in the LORD, and through the mercy of the most High he shall not be moved.”

This is the foundation of everything in the psalm. David trusts, and that trust rests on the mercy of God, not on David’s own strength. That is why he is not moved. “They that trust in the LORD shall be as mount Zion, which cannot be removed, but abideth for ever” (Psalm 125:1). The verses that follow (8 through 12) speak of the LORD dealing with those who set themselves against Him. Verse 11 gives the reason: they intended evil against God, and their schemes will not succeed. The One whom David trusts is greater than every power that opposes Him, and that is part of why the king can rest.

Verse 13: “Be thou exalted, LORD, in thine own strength: so will we sing and praise thy power.”

The psalm ends by turning the attention away from the king and onto the LORD. “Be thou exalted.” And notice the word “we.” David invites everyone into the song. This is where all true thanksgiving leads: not to what we have been given, but to the Giver, and to singing His praise together.

Carrying this forward

If you can look back and see prayers the Lord has answered, take time to say thank you for them, and be specific. It is easy to let thankfulness fade once the answer has come and life has moved on. David does not let it. He sings. Let what the Lord did then become gladness now, and remember that He met you with goodness long before you knew to ask.

And if today is just an ordinary day, that is enough reason to rejoice. You do not need a victory to give thanks, only a God who is worthy of it, and He is. Trust Him with what is ahead, and let your heart say with David: “Be thou exalted, LORD, in thine own strength: so will we sing and praise thy power” (Psalm 21:13).