“Among your books, in this assortment that does not make up a library, a dead or dormant part can still be distinguished, which is the store of volumes put aside, books read and rarely reread, or books you have not and will not read but have still retained (and dusted), and then a living part, which is the books you are reading or plan to read or from which you have not yet detached yourself or books you enjoy handling, seeing around you.”