11 He stretched out his hand over the sea, he shook the kingdoms: the LORD hath given a commandment against the merchant city, to destroy the strong holds thereof.
(Verse 11.) He stretched out his hand over the sea, he troubled the kingdoms. Who stretched out his hand? Without a doubt, based on the context of the words themselves, it is God, about whom he said above: the Lord of hosts has planned this, to take away the pride of all glory. He therefore stretched out his hand over all the seas, signifying the world and its inhabitants, and troubled all the nations, among which, even you, Tyre, were troubled, whether it be over the sea, on which you are specifically situated.
(Vers. 10, 11.) Work your land: for the ships do not come from Carthage at all, and your hand does not prevail, which provokes the kings in the sea. There is much disagreement among other interpreters, and the Septuagint edition diverges from the Hebrew itself in this place, but let us continue with the proposed argument. Above, he had said: Go to Carthage, howl you who dwell on the island. Now he speaks the opposite, because the ships no longer come from Carthage, work your land. For it is beneficial for Tyre that foreign ships perish, so that its people are forced to work their own land. As it is said in Proverbs: 'Whoever works his own land will have plenty of bread' (Prov. 21:11), so that he may live off the produce of his work without the uncertainty of shipwrecks and the danger of drowning, but instead with the fruits of his labor. Concerning this, it is sung in the Psalms to the righteous: 'You shall eat the fruit of the labor of your hands' (Ps. 128:2). It is written in Hosea that the ways of a prostitute are hedged with thorns by the Lord, so that she cannot pursue her lovers, and thus, compelled by this necessity, she may return to her original husband. And as we frequently observe in the affairs of the world, many who could not perceive the Lord through prosperity and the abundance of all things, came to understand through poverty, and turned to the works of justice, after the happiness of this world failed to prevail over the work of their hands, which formerly provoked kings in the sea, or disturbed them, as Symmachus puts it; whose heart is in the hand of God. And would that we too, despising the commerce of this sea, cultivate our own land, and not wait for the ships of Carthage, or the ships of Tyre, which used to go to Carthage, lest we be subjected to the power of the dragon who rules over the sea! But let us set a firm footing on the earth, rather hastening towards the heavens, let us work our own land, here sowing, there harvesting. Let our hand, which was previously engaged in the affairs of the world, and even capable of altering the state of kings, that is, the saints, according to its power and success, become weak in matters of the sea, so that it may be strong in the work of its own land.
[AD 420] Jerome on Isaiah 23:11