Fan Casting As the Good Book Says... in Sort by Tropes

In English, the Good Book is a metonymic for The Bible. Being by far one of the most influential books in Western culture, it is a natural quote source when wanting to lend some gravitas to a fictional situation. Having a character quote from it lets us know they're either a scholar, a priest, deeply religious, a bonafide supernatural being or a psychopath. But also, having such a far-reaching influence, quoting it sounds familiar enough that it might be recognizable to many members of the audience. The fact that the Bible's text is numerically divided into relatively short chapters and verses also makes it easy to refer to.