Five Laws of Library Science

1. Books are for use.
2. Every reader their book.
3. Every book their reader.
4. Save the time of the reader.
5. The library is a growing organism.

S. R. Ranganathan, 1931

Notes

1. A library is not an archive. Books will get damaged. Books will be lost. When books are no longer of use, they should be discarded.
2.-3.
4. The organization of the library should be suited to the needs and interests of library patrons. This may (and often does) change over time.