User blog comment:FairyRaven/Fairy Tail Chapter 435 & 436: The Cry of Victory & Memoirs, Review and Commentary/@comment-5303512-20150518115901/@comment-1359322-20150518135659

Maybe that's why he sealed that book. Because those are his sentiments towards life. Mard and Tartarus only know the book is sealed by not by who. Well that's the same for us too though.