There are times when

… I can find myself in a book, too, for two or three hours. But afterward I have such an urge to go out and reach for other people. Very often they’re not around. There’s also a metaphysical loneliness. We all feel it. The burden of living one’s own life is experiencing sensations that no one else can share. You take a step in a house, you start moving around the house, no one else moves with you. You’re walking by yourself.
― David Ignatow