 It is mentioned in the book that the reason Foo is falling a part is because Phoebe could not keep people longing for good; so they became selfish.There is a spin-off book, known as "Professor Winsnicker's Book of Proper Etiquette for Well-mannered Sycophants" which is Clover's handbook from when he was in school.Obert Skye happened to come across it.