" My house is full of books. I suppose that I have read all of them, bar reference books and poetry collections in which I will not have read every poem. I have forgotten many, indeed most. At some point, I have emptied each of these into that insatiable vessel, the mind, and they are now lost somewhere within. If I reopen a book, there is recognition--oh yes, I've been here--but to have the contents again, familiar, new-minted, I would have to read right through. What happens to all this information, this inferno of language? Where does it go? Much, apparently, becomes irretrievable sediment; a fair amount, the significant amount, becomes that essential part of us--what we know and understand and think about above and beyond our own immediate concerns. It has become the life of the mind. What we have read makes us what we are--quite as much as what we have experienced and where we have been and who we have known. To read is to experience.

I can measure out my life in books. They stand along the way like signposts: the moments of absorption and empathy and direction and enlightenment and sheer pleasure. "

― Penelope Lively , Dancing Fish and Ammonites: A Memoir