I will make a horn grow for David and set up a lamp for my anointed one

Psalm 132:11-18
The Lord swore an oath to David, a sure oath he will not revoke: “One of your own descendants I will place on your throne.
If your sons keep my covenant and the statutes I teach them, then their sons will sit on your throne for ever and ever.”
For the Lord has chosen Zion, he has desired it for his dwelling, saying, This is my resting place for ever and ever; here I will sit enthroned, for I have desired it. I will bless her with abundant provisions.
v17. Here I will make a horn grow for David and set up a lamp for my anointed one. I will clothe his enemies with shame, but his head will be adorned with a radiant crown.”
Zion is God's chosen home, his appointed center for worship, in the city of Jerusalem, seat of kings.
V17 points to the future; there is a great king yet to come.
Why?
God desire Zion and chose there be his seat, there is a king will come, who is God's anointed one; Jesus Christ.
If anyone keep God's covenant and the statutes God teach them, then they will be blessed forever.
Horn means salvation.  Lamp means guidance, Anointed one means Jesus.
How wonder that David's prayer become the prediction of Messiah, Jesus Christ.
How?
Keep God's covenant and statutes, trust in the Lord and follow Jesus Christ to love others.