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One must always be careful of books, and what is inside them, for words have the power to change us.
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About this quote

Meaning

This line urges readers to treat books not as passive objects but as forces capable of reshaping the person who encounters them. The idea is that words carry genuine weight: they can shift your perspective, challenge your assumptions, and leave you fundamentally different from the person who first opened the cover. The caution in the phrasing is not a warning to avoid reading but rather an invitation to read with full awareness of its power.

Context

The line comes from the first novel in the Shadowhunter Chronicles, a young adult fantasy series. It is spoken within a world where ancient knowledge is both precious and dangerous, making the sentiment especially fitting. The broader story follows a young protagonist discovering a hidden magical society, and the theme of knowledge transforming identity runs throughout the series. The quote has since traveled well beyond its fictional setting and is frequently cited by readers and educators who care about the role literature plays in personal growth.

About the author

Cassandra Clare is an American author best known for her extensive young adult fantasy fiction. She built a large and devoted readership through her interconnected series set in the Shadowhunter universe, beginning with City of Bones. Her work blends mythology, action, and questions about identity and belonging. She has spoken publicly about how literature shaped her own sense of self, which gives a personal resonance to a quote that champions the transformative potential of the written word.

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