There will I make the horn of David to bud: I have ordained a lamp for my anointed.
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Augustine of Hippo
20. "I will clothe her priests with salvation, and her saints shall rejoice and sing" (ver. 16). We are now at the end of the Psalm; attend for a short space, Beloved. "I will clothe her priests with salvation, and her saints shall rejoice and sing." Who is our salvation, save our Christ? What meaneth, therefore, "I will clothe her priests with salvation"? "As many of you as have been baptized into Christ, have put on Christ." "And her saints shall rejoice and sing." Whence shall they rejoice and sing? Because they have been clothed with salvation: not in themselves. For they have become light, but in the Lord; for they were darkness before. Therefore he hath added, "There will I raise up the horn of David" (ver. 17): this will be David's height, that trust be put in Christ. For horn signifieth height: and what sort of height? Not carnal. Therefore, while all the bones are wrapped up in flesh, the horn goeth beyond the flesh. Spiritual altitude is a horn. But what is spiritual loftines...
There. Literally, "thither "(Haydock) Illuc, as Christ came from heaven. (Berthier)
Horn. Power and glory. This regards Solomon, and the Messias. Hebrew, "I will make to bud", alluding to Christ's miraculous birth, Isaias iv. 2. (Calmet)
Lamp. St. John the Baptist, (John v. 35.; St. Athanasius) or Christ himself, (Luke ii. 32., and Apocalypse xxi. 23.) though it may also be understood of David's son and successor. (Calmet)
Yet this lamp was too dreadfully extinguished. (Berthier)
Christ protects his Church, which is placed for the instruction of all. (Worthington) ...