You get to the age when a book’s power to make you think becomes the first thing you notice about it. You can practically sense that power when you pick the book up. The books I already had in the house presumably once generated the same sort of charge when I contemplated buying them. Now there they were, still in their thousands despite the recent winnowing. I roamed slowly among them: old purchases begging to be read again even as the new purchases came in at the rate of one plastic shopping bag full every week. Insanity, insanity. Or, as Johnson might have said, vanity, vanity.