Early-1971, in an effort to attract as many youngsters to the premises as possible, Marguerite Hart — children’s librarian at the newly-opened public library in Troy, Michigan — wrote to a number of notable people with a request: to reply with a congratulatory letter, addressed to the children of Troy, in which the benefits of visiting such a library were explained in some form. This is Isaac Asimov's reply.

Dear Boys and Girls,

Congratulations on the new library, because it isn’t just a library. It is a space ship that will take you to the farthest reaches of the Universe, a time machine that will take you to the far past and the far future, a teacher that knows more than any human being, a friend that will amuse you and console you—and most of all, a gateway, to a better and happier and more useful life.

Isaac Asimov (1920–1992)
Author and biochemist