The origin of the proverb "an idle brain is the devil's workshop" can be linked to religious teachings, particularly from Christian traditions, with a similar expression appearing in texts by Saint Jerome in the 4th century. The proverb warns that a lack of meaningful activity can lead to negative thoughts or actions, because the mind, left to wander without purpose, may entertain unhealthy or destructive thoughts. It suggests that staying engaged in productive or virtuous tasks helps prevent moral decline. While it is often used to encourage hard work, it also implies that mental stagnation can be just as harmful as physical laziness.

What is the origin of the proverb "an idle brain is the devil's workshop" and when to use it?

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an idle brain is the devil's workshop

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英語での「an idle brain is the devil's workshop」の定義と意味

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