Cyrill of Alexandria
They will consume but remain unfulfilled; they will engage in immoral acts without correction. Once more, He preserves a remnant for the descendants of Israel, demonstrating through the phrase, "and they shall eat, and yet shall not be satisfied," that the priestly duties will not entirely come to an end. Indeed, anyone who contemplates the historical exiles and captivities of Israel, or the devastation of Judea by the Romans as a consequence for Christ, will observe that both the remnant of Israel and the ministry of the law have been maintained. Even when they were taken away by Salmanasar and Theglaphalasar into Assyria and Midian, a small number of Israelites who remained offered sacrifices to the priests, providing what they could while adhering to tradition.
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Similarly, during the recent conflict, under Caesar Augustus, when their land faced destruction and they were scattered across various nations, they continued to give whatever offerings they could manage, even though they faced limitations in rewarding the holy and chosen people. Even now, despite the absence of ancient sacrifices, they still make offerings, for it is unlawful to sacrifice outside Jerusalem. Thus, "they shall eat, and shall not be satisfied" indicates that they will receive little, struggle to attain it, and find it inadequate for true fulfillment. This reflects the decline of their previous honor and the loss of former favor. After indulging in fornication, it is asserted that they "shall not be reformed." As previously mentioned, those who stray from God—an act I believe embodies spiritual fornication—cannot fully enjoy the gifts bestowed upon them, nor gather the heavenly sustenance needed for true nourishment, or attain reform in their hearts and actions until they find true satisfaction, for God is the source of all goodness within us and the sustainer of our thoughts. Further reference can be found in verse 11.