Chapter 5 — Part I: The Creed — Article III: Who Was Conceived by the Holy Ghost, Born of the Virgin Mary
Section 20. Types and Prophecies of the Conception and Nativity — The mysteries of this admirable Conception and Nativity being, therefore, so great and so numerous, it accorded with the plan of divine Providence to signify them by many types and prophecies. Hence the holy Fathers understood many things which we meet in the Sacred Scriptures to refer to these mysteries, particularly that gate of the sanctuary which Ezechiel saw closed; the stone cut out of the mountain without hands, which became a great mountain and filled the universe, of which we read in Daniel; the rod of Aaron, which alone budded of all the rods of the princes of Israel; and the bush which Moses saw burr without being consumed.'