Zorobabel's Mountain and the Mountain Cast into the Sea
Old Testament: Zacharias 4:6-7
... This is the word of the Lord to Zorobabel, saying: Not with an army, nor by might, but by my spirit, saith the Lord of hosts. Who art thou, O great mountain, before Zorobabel? thou shalt become a plain: and he shall bring out the chief stone, and shall give equal grace to the grace thereof.
New Testament: Mark 11:22-24
And Jesus answering, saith to them: Have the faith of God. Amen I say to you, that whosoever shall say to this mountain, Be thou removed and be cast into the sea, and shall not stagger in his heart, but believe, that whatsoever he saith shall be done; it shall be done unto him.
The connection
Zorobabel faces a literal obstacle to rebuilding the Temple, some great mass of rubble or opposition the text simply calls a mountain, and God's answer is not siege-engines but a word: not by might, but by my spirit. The mountain does not get moved by force; it becomes a plain before the word alone. Christ takes the same figure and hands it directly to His disciples as the shape of prayer itself: a mountain removed and cast into the sea, not by their strength but by faith that does not stagger. What was spoken once over a governor rebuilding one temple becomes the ordinary grammar of Christian prayer.
Moral sense
The mountains before each soul, whatever seems immovable by will or effort, answer to the same word that leveled Zorobabel's: not might, but a spirit that does not stagger in belief.
Anagogical sense
The plain where the mountain stood is where the chief stone is brought out and given grace; every obstacle removed by faith clears ground for the cornerstone to be seen more fully.
Warrant
Mark 11:22-24 does not cite, name, or quote Zacharias 4:6-7. Christ's teaching on faith moving mountains echoes the prophet's image but does not quote it as fulfilled.
Catechism of the Catholic Church, paragraph 2610.
The verses
Zacharias 4:6 · Zacharias 4:7 · Mark 11:22 · Mark 11:23 · Mark 11:24