<human>:  Why did the author use the word ‘fall’ in the title of the book ‘The Fall of Man’?
<bot>: The book is about the fall of man, which is a metaphor for the fall of humanity. The author, who is a Christian, uses the term “fall” in the title to convey the idea that humanity is on a path of decline, and that we need to repent and turn back to God.