With a bible, you can modify the procedure so that each word is from a particular bible verse. You could give each book an index number, then use the xth word in nth chapter of the book.[/suote]
Sure, but that's another layer of added complexity, which means another layer for you to either forget and lose access to your coins, or another layer for you to mess up and lose access to your coins. Additionally, you will want to back up the exact translation and edition to go with your book cypher, and a list of number pairs with "King James Version (1769)" makes it completely obvious that your number list is a book cipher and therefore trivial to decipher.