PewDiePie mentioned The Discourses of Epictetus by Epictetus 3 times

On Felix's bookshelf.

We read Epictetus Discourses and selected writings. Did you love it did you hate it? What would you rate it? [...] I picked this book because it's fairly simple, it's straightforward and it's a good introduction to stoic philosophy. There's probably better examples but this is what I chose. I really really like this book

— PewDiePie

Marcus frequently quotes Epictetus in his famous written word Meditations

— PewDiePie