Much of the book is a cautionary tale of false roads to salvation:
...unless I could obtain the righteousness of Man that never had sinned, neither mine own, not all the righteousness in the World could save me.This is a dismal view of the requirements of a righteous life, but a great example of allegory.
*The edition I read is from my library: The Riverside Literature Series, Houghton Mifflin Company, The Riverside Press Cambridge, Edited, with Introduction and Notes, by William Vaughn Moody, 1896. This copy has annotations from 1933 by Abraham Klein. It appears to have been later sold to Cynthia Feingold of Scarsdale, NY.