Heart: The Unregenerate is Foolish
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Proverbs 12:23
A shrewd man keeps his knowledge to himself, but a foolish heart proclaims its folly.
Proverbs 22:15
Foolishness is bound up in the heart of a child, but the rod of discipline drives it far from him.
Ecclesiastes 9:3
This is an evil in everything that is done under the sun: There is one fate for everyone. Furthermore, the hearts of men are full of evil and madness while they are alive, and afterward they join the dead.