George Haydock's Catholic Commentary
Psalms 77:69
As of unicorns. That is, firm and strong, like the horn of the unicorn. This is one of the chief of the propositions of this psalm, fore-shewing the firm establishment of the one, true, and everlasting sanctuary of God, in his Church. (Challoner) (Menochius) --- It was preserved before Christ, and will remain till the end of time. (Worthington) --- The temple was not built by David: but the spot was consecrated for it, (2 Kings xxiv.) and the ark was placed on Sion; which was the land which he had founded for ever for this purpose. Hebrew ramim, means "unicorns, (Chaldean; St. Jerome) heights, (Montanus) palaces," (Pagnin) &c. Santificium and s anctuarium, have the same import. (Haydock) --- In the land. Hebrew, "as the land." Septuagint have read b for c, as well; (Berthier) and it is observable that Montanus translates the latter, though the former occur in the Hebrew text below, edition 1632: so easily may these letter be confounded! (Haydock) --- The temple was to have the same stability as the earth, and was but one, like the horn of the unicorn, which is most solid and beautiful. (Calmet) --- Yet this could not be understood of the material temple, which was the most magnificent structure in the world. It was fulfilled in the Church of Jesus Christ, who is also the true David, ver. 72. (Haydock) --- The crowning of David, who was his figure, was a great blessing to Israel. (Worthington)