John Chrysostom
In times of conflict, He offers a sign as a condition for victory. And behold, He proclaims to you, Consume this year the seed that springs from the harvested grain (Isaiah 37:30); He provides a sign reflecting upon the past, for the Lord signifies not only when He intends for them to have faith in future events but also when He wants them to remember what has come before. Similarly, in the narrative of the bronze serpent, which symbolized hands lifted in supplication: it is commanded, document this for remembrance, so that it may be known to future generations and other nations (cf. Deuteronomy 31:19). When events are imminent, no signs are necessary; however, distant events require them.
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Observe now the extraordinary conclusion and the prophecy: extraordinary was the outcome of the battle when the angel appeared and the Assyrian army was defeated. Yet even more remarkable was the prophecy: you shall sow and harvest as in times of tranquility, not as in such moments of peril, when the adversary descends like a thunderbolt. He appended a sign to the signs, not for the righteous, who have faith without the need for indicators, but for others, so that all might be unveiled, and through the triumph over numerous foes, they could recognize Him as the Lord of death, and through the extension of Hezekiah’s life, acknowledge Him as the sovereign and bestower of life.