Forgotten Books

Nige wonders:

Does it matter how much we remember of books? Does it matter even if no memory at all is available to our conscious mind? I know I must have read large numbers of books that I don’t even remember reading – occasionally I find myself reading one, and realise I’m actually rereading… What I like to think is that the better ones (of the books I do at least remember reading) have left some beneficial trace at a level somewhere just below the conscious, retrievable memory – an afterglow, an aura, a faint fragrance… Or maybe I’m deluding myself?