Why Doesn't God Destroy This World?

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Thus saith the LORD, As the new wine is found in the cluster, and one saith, Destroy it not; for a blessing is in it: so will I do for my servants' sakes, that I may not destroy them all. And I will bring forth a seed out of Jacob, and out of Judah an inheritor of my mountains: and mine elect shall inherit it, and my servants shall dwell there. And Sharon shall be a fold of flocks, and the valley of Achor a place for the herds to lie down in, for my people that have sought me (Isaiah 65:8-10).