To dream that you are in a library signifies your search for knowledge and your hunger for ideas. You may be trying to seek out new meanings to life. You need to study and evaluate your situation before taking action. If the library is disorganized, then it suggests that too much information is coming at you at the same time. You are having difficulty sorting it all out.
To dream that you cannot find a book in the library or that the book you are looking for is already checked out suggests that a certain aspect of your self is lacking enrichment or is under developed.
To see a library in your dream symbolises the knowledge you have accumulated over the years.