This book is gold!

Incidentally, there is a 2nd edition in French, but not (yet?!) in English.

Yes, it is hard, but reading is not a contest of "how many pages can I read per day". With this book, sometimes I just read one/day. Other times it's a negative number. Meaning, I need to go back a few pages. What matters most is the content, and this book has it. No pauses, no cheap humour, just pearls on every paragraph. That puts the burden on the reader. It's a book to be studied, not read.