Also I will make him my firstborn, higher than the kings of the earth.
Read Chapter 89
Augustine of Hippo
"And I will make Him my first-born; higher than the kings of the earth" (ver. 27). Our Martyrs, whose birthdays we are celebrating, shed their blood on account of these things, which were believed though not yet seen; how much more brave ought we to be, as we see what they believed? For they had not yet seen Christ raised on high among the kings of the earth: as yet princes were taking counsel together against the Lord and His Anointed: what follows in the same Psalm was not then fulfilled, "Be wise now therefore, O ye kings: be learned, ye that are judges of the earth." Now indeed Christ has been exalted among the kings of the earth.
First-born. Or favourite, Exodus iv. 22., and Jeremias xxxi. 9. What king could be preferred to David for piety, riches? Yet he was only a feeble type of our Saviour, who surpasses all kings, as much as the reality does a shadow. (Calmet) (Colossians i. 15., Romans viii. 29., and Apocalypse i. 5.) (Berthier)
High. Hebrew helyon, which is one of the titles of God, and belongs to Christ, (Haydock) who is King of kings, and heir of all, Hebrews i. (Menochius)