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Proverbs 15:21
Folly is joy to him who is destitute of discernment,
But a man of understanding walks uprightly.
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Ecclesiastes 2:1-3
I said in my heart, “Come now, I will test you with mirth; therefore enjoy pleasure”; but surely, this also was vanity. I said of laughter—“Madness!”; and of mirth, “What does it accomplish?” I searched in my heart how to gratify my flesh with wine, while guiding my heart with wisdom, and how to lay hold on folly, till I might see what was good for the sons of men to do under heaven all the days of their lives.
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Ecclesiastes 2:12-13
Then I turned myself to consider wisdom and madness and folly;
For what can the man do who succeeds the king?—
Only what he has already done.
Then I saw that wisdom excels folly
As light excels darkness.
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Ecclesiastes 7:25
I applied my heart to know,
To search and seek out wisdom and the reason of things,
To know the wickedness of folly,
Even of foolishness and madness.