Proverbs 30:21

21 “Under three things the earth trembles, under four it cannot bear up:

Read Proverbs 30:21 Using Other Translations

For three things the earth is disquieted, and for four which it cannot bear:
Under three things the earth trembles; under four it cannot bear up:
There are three things that make the earth tremble— no, four it cannot endure:

What does Proverbs 30:21 mean?

John Gill's Exposition of the Bible
Proverbs 30:21

For three [things] the earth is disquieted
The inhabitants of it are made very uneasy; and for four [which] it cannot bear;
they are a load and burden upon it, and are intolerable to those that dwell on it, and make them very uncomfortable.

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