Bear is sure that he has all the books he will ever need (seven of them) at home. But his friend Mouse convinces him to come to the library, which Bear maintains is too big and has "far too many books". Even as Bear gets quite loud about his opinions the lovely librarian, rather than "shushing" him, invites him to join the other animals at story time.
It is very important to note that while there is some shushing going on in this work, it is not the librarian doing it. The librarian is engaging and welcoming, and knows just how to find the right book for the right animal. That's what librarians do.