The beginning of the words of his mouth is foolishness: and the end of his talk is mischievous madness. The beginning of the words of his mouth is foolishness: and the end of his talk is mischievous madness.

Illustrating the folly and injuriousness of the fool's words; last clause of .

Mischievous madness - "mischievous" first to others, then to himself, in just retribution.

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