Read the excerpt from Walden. I left the woods for as good a reason as I went there. Perhaps it seemed to me that I had several more lives to live, and could not spare any more time for that one. It is remarkable how easily and insensibly we fall into a particular route, and make a beaten track for ourselves. I had not lived there a week before my feet wore a path from my door to the pondside; and though it is five or six years since I trod it, it is still quite distinct. What is the metaphor being used in this passage? lives to live door beaten track pondside