The conversation must be located where the walkers are

Now at least the moon is full, and I walk alone, which is best by night, if not by day always. Your companion must sympathize with the present mood. The conversation must be located where the walkers are, and vary exactly with the scene and events and the contour of the ground. Farewell to those who will talk of nature unnaturally, whose presence is an interruption. I know but one with whom I can walk. I might as well be sitting in a bar-room with them as walk and talk with most. We are never side by side in our thoughts, and we cannot hear each other�s silence. Indeed, we cannot be silent. We are forever breaking silence, that is all, and mending nothing. How can they keep together who are going different ways!

— Thoreau