And on this mountain shall the LORD of hosts make unto all people a feast of rich things, a feast of wines on the lees, of fat things full of marrow, of wines on the lees well refined.
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Cyril of Alexandria
Having said that the Lord will reign in Zion and Jerusalem, Isaiah leads us to the mystical meaning of the passage. Thus Zion is interpreted as a high place that is good for surveillance, and Jerusalem is the vision of the world. In fact, the church of Christ combines both: it is high and visible from everywhere, and is, so to speak, located on the mountain. The church may be understood as high also in another way: there is nothing low in it, it is far removed from all the mundane things, as it is written, “I will be exalted among the nations, I will be exalted in the earth!” Equally elevated are its orthodox and divine doctrines; thus the doctrine about God or about the holy and consubstantial Trinity is true, pure and without guile. “The Lord of hosts will make for all people,” not just for the Israelites elected for the sake of their patriarchs but for all the people of the world. What will he make? “A feast of wines on the lees; they will drink joy, they will drink wine. They will ...
Having been counted worthy of this holy chrism, you are called Christians, verifying the name also by your new birth. For before you were deemed worthy of this grace, you had properly no right to this title but were advancing on your way toward being Christians.
Moreover, you shall know that in the old Scripture there lies the symbol of this chrism. For at the time Moses imparted to his brother the command of God and made him high priest, he anointed him after bathing him in water. And Aaron was called Christ or anointed, evidently from the typical anointing. So also the high priest, in advancing Solomon to the kingdom, anointed him after he had bathed in Gihon. To them, however, these things happened in a figure, but to you not in a figure but in truth; because you were truly anointed by the Holy Spirit. Christ is the beginning of your salvation. He is truly the first fruit, and you are what follow. If the first fruit is holy, obviously its holiness will pass to the remainder also.
Mountain of Sion, a figure of the Church, and of heaven. The Jews shall feast: yea, some of all nations shall partake of the blessed Eucharist, and obtain heaven. The expressions are too grand for a corruptible feast. (Calmet)
Wine. Literally, "of vintage "(Haydock) on which occasion great rejoicings were made. (Hesiod, Hercul. 297.)
Protestants, "of wines on the lees. "(Haydock)
In the East, the wines were very thick, Psalm lxxv. 9. (Calmet)
On the rejection of the Jews, the Gentiles were converted. (Worthington)
They will not hunger because they will feed upon living bread, for he said, “I am the living bread which came down from heaven.” Neither will they thirst, because they will drink from a cup so splendid as to enact in them the truth he spoke: “Whoever believes in me will never thirst”; and again: “Whoever drinks from the water I give him will receive in himself a fountain of water springing up to eternal life.” Neither will the sun strike them, nor will they be burned by the deadly fire of its heat. God made a similar promise to his church through Isaiah, saying that he would be “a shelter from the storm, a shade from the heat.” Here he declares the purity of his sacraments to thrive in his own and that none of them will be oppressed by the heat of temptation. “For the Lamb in the midst of the throne governs them.” Previously it had said that the Lamb seated on the throne received the scroll, but now it says that the Lamb in the midst of the throne governs them. It does so to teach that...
Moreover, this same Isaiah foretells that while those who were engaged in the study of the law from childhood to old age did not believe, to the Gentiles every mystery should be transferred. His words are, “And the Lord of hosts shall make a feast on this mountain for all nations.” … This was the counsel of the Almighty respecting all the nations. - "Commentary on the Apostles’ Creed 19"