Text visualization allows you to get a basic grasp of written content that would otherwise be too time-consuming to read for your purposes. The data in question is presented in an engaging and user-friendly manner, using visual design principles to convey the most (and most pertinent) meaning in the shortest amount of time.
This textual visualization allows readers to see events unfold positively or negatively within the narrative of the Bible. The related blog post details the methodology used for this visualization; a full-size image is also available for download.
The following links will take you to online repositories of digital texts; many of these texts allow you to make advanced comparisons. The repositories are not limited to books. You can also analyse Wikipedia entries, fashion/beauty archives, State of the Union addresses, and recent online news publications.