11 “Come and see the works of the Lord”. Now of this taking up, what has the Lord done? Consider the whole world, come and see. For if you come not, you see not; if you see not, you believe not; if you believe not, you stand afar off: if you believek, you come; if you believek, you see. For how came we to that mountain? Not on foot? Is it by ship? Is it on the wing? Is it on horses? For all that pertain to space and place, be not concerned, trouble not yourself, He comes to you.
For out of a small stone He has grown, and become a great mountain, so that He has filled all the face of the earth. Why then would you by land come to Him, who fills all lands? Lo, He has already come: watch thou. By growing He wakes even sleepers; if yet there is not in them so deep sleep, as that they be hardened even against the mountain coming; but they hear, “Awake, you that sleepest, and arise from the dead, and Christ shall give you light.” For it was a great thing for the Jews to see the stone.
For the stone was yet small: and small they deservedly despised it, and despising they stumbled, and stumbling they were broken; remains that they be ground to powder. For so was it said of the stone, “Whosoever shall fall upon that stone shall be broken; but on whomsoever it shall fall, it will grind him to powder.” It is one thing to be broken, another to be ground to powder. To be broken is less than to be ground to powder: but none grinds He coming exalted, save whom He broke lying low.
For now before His coming He lay low before the Jews, and they stumbled at Him, and were broken; hereafter shall He come in His Judgment, glorious and exalted, great and powerful, not weak to be judged, but strong to judge, and grind to powder those who were broken stumbling at Him. For “A stone of stumbling and a rock of offense,” is He to them that believe not. Therefore, brethren, no wonder if the Jews acknowledged not Him, whom as a small stone lying before their feet they despised.
They are to be wondered at, who even now so great a mountain will not acknowledge. The Jews at a small stone by not seeing stumbled; the heretics stumble at a mountain. For now that stone has grown, now say we unto them, Lo, now is fulfilled the prophecy of Daniel, “The stone that was small became a great mountain, and filled the whole earth.” Wherefore stumble ye at Him, and go not rather up to Him? Who is so blind as to stumble at a mountain? Came He to you that you should have whereat to stumble, and not have whereto to go up?
“Come ye, and let us go up to the mountain of the Lord.” Isaiah says this: “Come ye, and let us go up.” What is, “Come ye, and let us go up”? “Come ye,” is, Believe ye. “Let us go up,” is, Let us profit. But they will neither come, nor go up, nor believe, nor profit. They bark against the mountain. Even now by so often stumbling on Him they are broken, and will not go up, choosing always to stumble. Say we to them, “Come ye, and see the works of the Lord:” what “prodigies He has set forth through the earth.” Prodigies are called, because they portend something, those signs of miracles which were done when the world believed. And what thereafter came to pass, and what did they portend?
Source: The Enarrations, or Expositions, on the Psalms (New Advent)