What God conveyed by the anointing of oil to those who were anointed to be kings, this the Holy Spirit conveyed upon the man Christ, adding thereto the expiation; wherefore when born He was called Christ; and thus it proceeds, “who is called Christ.”
Reproduced in full. Translation: Oxford 1841 (Newman), public domain (Public domain).
Also cites: Quaest. Nov. et Vet. Test. q. 49