This book broke me completely, but I could not put it down. It is such a study of life and humans. People have always wondered how can I be such a happy human after reading such depressing literature. It is true, books I read and love strip human experience down to its core and teach you to not take anything for granted. Teach you to appreciate every little moment and not to waste a single second on something you truly dislike. 
This book is devastating, and not for everyone, but the ones who read it will never look at life the same.