"But the stone that struck the image became a great mountain and filled the whole earth..."

The Holy Prophet Daniel's Prophecy of the Incarnation of Christ (source)

  
"You saw, O king, and behold, a great image. This image, mighty and of exceeding brightness, stood before you, and its appearance was frightening. The head of this image was of fine gold, its breast and arms of silver, its belly and thighs of bronze, its legs of iron, its feet partly of iron and partly of clay. As you looked, a stone was cut out by no human hand, and it smote the image on its feet of iron and clay, and broke them in pieces; then the iron, the clay, the bronze, the silver, and the gold, all together were broken in pieces, and became like the chaff of the summer threshing floors; and the wind carried them away, so that not a trace of them could be found. But the stone that struck the image became a great mountain and filled the whole earth.*** "This was the dream; now we will tell the king its interpretation. And in the days of those kings the God of heaven will set up a kingdom which shall never be destroyed, nor shall its sovereignty be left to another people. It shall break in pieces all these kingdoms and bring them to an end, and it shall stand for ever; just as you saw that a stone was cut from a mountain by no human hand, and that it broke in pieces the iron, the bronze, the clay, the silver, and the gold. A great God has made known to the king what shall be hereafter. The dream is certain, and its interpretation sure."
-Daniel 2:31-36; 44-45, read at Great Vespers for the Nativity of Christ
  

(source)

  

"***This vision clearly portrayed through the mountain the height of the Virgin's holiness and the power of the Holy Spirit which overshadowed her. Through the image of the Stone, Christ was portrayed, Who was seedlessly born of her, and Who by His coming as the Godman would shatter and destroy all the kingdoms of the world, which were portrayed through the image; and He would raise them that believe in Him into His Heavenly Kingdom, which is eternal and everlasting."

(Source)

 

The Prophet Daniel, holding the scroll of his prophecy of the "Mountain cut out by no human hand", foreshadowing the Incarnation of Christ through the Theotokos (source)

  

Through the prayers of our Holy Fathers, Lord Jesus Christ our God, have mercy on us and save us! Amen!