From his essay “On Walking:”

At present, in this vicinity, the best part of the land is not private property; the landscape is not owned, and the walker enjoys comparative freedom. But possibly the day will come when it will be partitioned off into so-called pleasure grounds, in which a few will take a narrow and exclusive pleasure only, — when fences shall be multiplied, and man traps and other engines invented to confine men to the public road; and walking over the surface of God’s earth, shall be construed to mean trespassing on some gentleman’s grounds.