Edmund S. Morgan said this quote

“ The only way to make a library safe is to lock people out of it. As long as they are allowed to read the books 'any old time they have a mind to,' libraries will remain the nurseries of heresy and independence of thought. They will, in fact, preserve that freedom which is a far more important part of our lives than any ideology or orthodoxy, the freedom that dissolves orthodoxies and inspires solutions to the ever-changing challenges of the future. I hope that your library and mine will continue in this way to be dangerous for many years to come. ”