Folio, refers to the printing process where a full sheet of paper is cut only once. Thus, each page of a folio edition is twice the size of a common quarto edition. Only very important, precious books would be printed in folio format.
"Scripture," Winters replied without looking up.
"Ah?" Caman showed a look of surprise, walked up to Winters, and said in a rather cheerful tone: "If your purpose isn't pure, it's meaningless even if you can memorize the texts."
However, when Caman actually saw what book Winters was holding, his expression became very subtle.
What Winters was browsing was the Empire's common language scripture of the year 532 of the Imperial Calendar—a famous apocryphal text recognized by the church.
Winters, by the dining table, was still marveling: "Wow, how can it be printed so clearly?"