Classics are not classics because hoary with age — they are the steel balls which have worn down mountains but remained unchanged in the mill of time. – Martin H. Fischer (1879–1962)

Books that have become classics — books that have had their day and now get more praise than perusal — always remind me of retired colonels and majors and captains who, having reached the age limit, find themselves retired on half pay. – Thomas Bailey Aldrich

A dirty book is rarely dusty. – Author unknown