PewDiePie mentioned The Book of Five Rings by Musashi Miyamoto 3 times

On Felix's bookshelf.

Have you guys read The Book of Five Rings? It's this book, I talked about it before on the channel. It's written by an old samurai, how cool is that by the way? Uh it's super interesting. [...] It's very short but I really recommend it. [...] If you've never read a book in a long time and you're genuinely interested it's a really fun one to just dive into.

— PewDiePie

I've been enjoying just uh, keeping this in my pocket and reading uh, passages every once in a while, and just thinking about it. I'd be lying if I said I understand anything that is in this book.

— PewDiePie