Langdon suddenly realized that all of the catalysts that had been driving him-helping to save Vatican City, rescuing the four cardinals, coming face to face with the brotherhood he had studied for years-all of these things had evaporated from his mind.
There are no more uses of "catalyst" in the book.
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All signs point to you being the catalyst.
Gayle Forman -- Where She Went
Meg McCaffrey, prophecies are the catalysts for every important event—every quest or battle, disaster or miracle, birth or death.