The Lord of the Rings (4 books)

"Loved [this series] and other fiction when younger."

"[One of] the 10 best fiction books."

"I know it's cliche, but [this] is my favorite book ever."

"Paul Graham's answer to "any book recommendations for young adults?"

"The classic [series] I always give."

"[The series] that I’ve most often read."

"Neil Gaiman mentioned this series on "The Tim Ferriss Show" podcast."