In this sentence the author to say that the "knowledge should be in many places, and many think aspects. It should not be judged just by the book just a single book, or just one, "he said.
In this sentence, the author wants to say. "This knowledge should be used in many ways and many think. Do not judge a book that just one book or just one. "
In this sentence the author want to say "The knowledge should find in many places and many terms. Should not decide that only books that only a single book information or just one. "