there’s no (greater|) thief like a bad book
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used to suggest that a bad book has the potential to take away a person's values, morals, and time, and could potentially harm or damage them
The origin of the proverb "there is no thief like a bad book" is an Italian saying that warns about the dangers of harmful or misleading writings. The phrase suggests that a bad book, like a thief, can steal one's time, energy, and mental clarity, leading people in the wrong direction with false ideas or harmful content. Over time, the proverb has been used to express the idea that books with poor or misguided information can have a negative impact, taking away from one’s personal growth, understanding, or well-being.
- The library quickly withdrew the controversial novel from circulation after parents complained that there is no thief like a bad book, capable of corrupting even the most innocent of minds.