Therefore we will not fear, though the earth be removed, and though the mountains be carried into the midst of the sea;
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Augustine of Hippo
4. Now then, such security received, what say they? "Therefore will not we fear, when the earth shall be confounded" (ver. 2). Just before anxious, suddenly secure; out of too great tribulations set in great tranquillity. For in them Christ was sleeping, therefore were they tossed: Christ awoke (as but now we heard out of the Gospel), He commanded the winds, and they were still. Since Christ is in each man's heart by faith, it is signified to us, that his heart as a ship in this world's tempest is tossed, who forgetteth his faith: as though Christ sleeping it is tossed, but Christ awaking cometh tranquillity. Nay, the Lord Himself, what said He? "Where is your faith?" Christ aroused, aroused up faith, that what had been done in the ship, might be done in their hearts. "A helper in tribulations, which found us out too much." He caused that therein should be great tranquillity.
5. See what tranquillity: "Therefore will not we fear when the earth shall be confounded, and the mountains shall be carried into the heart of the sea." Then we shall find not fear. Let us seek mountains carried, and if we can find, it is manifest that this is our security. The Lord truly said to His disciples, "If ye have faith as a grain of mustard seed, ye shall say to this mountain, Be Thou removed, and be Thou cast into the sea, and it shall be done." Haply "to this mountain," He said of Himself; for He is called a Mountain: "It shall come to pass in the last days, that the mountain of the Lord shall be manifest." But this Mountain is placed above other mountains; because the Apostles also are mountains, supporting this Mountain. Therefore followeth, "In the last days the Mountain of the Lord shall be manifest, established in the top of the mountains." Therefore passeth It the tops of all mountains, and on the top of all mountains is It placed; because the mountains are preaching The Mountain. But the sea signifieth this world, in comparison of which sea, like earth seemed the nation of the Jews. For it was not covered over with the bitterness of idolatry, but, like dry land, was surrounded with the bitterness of the Gentiles as with sea. It was to be, that the earth be confounded, that is, that nation of the Jews; and that the mountains be carried into the heart of the sea, that is, first that great Mountain established in the top of the mountains. For He deserted the nation of the Jews, and came among the Gentiles. He was carried from the earth into the sea. Who carrying Him? The Apostles, to whom He had said, "If ye have faith as a grain of mustard seed, ye shall say to this mountain, Be thou removed,and be thou cast into the sea, and it shall be done:" that is, through your most faithful preaching it shall come to pass, that this mountain, that is, I Myself, be preached among the Gentiles, be glorified among the Gentiles, be acknowledged among the Gentiles, and that be fulfilled which was predicted of Me, "A people whom I have not known shall serve Me." ...