This quote by Thomas Fuller is a suggestion that knowledge is power. It recommends that understanding is something that can be discovered in books, however just if the book is opened. The quote suggests that if a book is not opened, it is like a block, or a barrier, that avoids the reader from acquiring understanding. It is a suggestion that understanding is not something that can be obtained without effort. It requires the reader to open the book and take the time to read and understand the product. The quote likewise suggests that knowledge is something that can be found in books, however just if the reader wants to put in the effort to open the book and gain from it. By doing so, the reader can acquire valuable understanding and insight that can be used to improve their life.
