If he had tried to explain to an inquisitive person what he was up to, the mystery of his identity would only have deepened. In a culture with very limited literacy, to be interested in books was already an oddity.

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All the same, monastic rules did require reading, and that was enough to set in motion an extraordinary chain of consequences. Reading was not optional or desirable or recommended; in a community that took its obligations with deadly seriousness, reading was obligatory. And reading required books. Books that were opened again and again eventually fell apart, however carefully they were handled. Therefore, almost inadvertently, monastic rules necessitated that monks repeatedly purchase or acquire books.