Final answer:
The literary device used in the quote 'In his mind, Jonas had questions. A thousand. A million questions. As many questions as there were books lining the walls,' is hyperbole.
Step-by-step explanation:
The literary device used in the quote, 'In his mind, Jonas had questions. A thousand. A million questions. As many questions as there were books lining the walls,' is hyperbole.
Hyperbole is a figure of speech that involves exaggeration for emphasis or dramatic effect. In this quote, the speaker uses hyperbole to emphasize the overwhelming number of questions in Jonas' mind by comparing it to the countless books on the shelves.
This hyperbolic statement helps the reader understand the immense curiosity and complexity of Jonas' thoughts.