It takes a lot of experience of life to see why some relationships last and others do not. But we do not have to wait for a crisis to get an idea of the future of a particular relationship. Our behavior in little every incidents tells us a great deal.
I won't mention names, but in my career, the most talented people invariably are the easiest and nicest to get along with.
A book is a fragile creature, it suffers the wear of time, it fears rodents, the elements and clumsy hands. so the librarian protects the books not only against mankind but also against nature and devotes his life to this war with the forces of oblivion.