It must not be imagined that a walking tour, as some would have us fancy, is merely a better or worse way of seeing the country. There are many ways of seeing landscape quite as good; and none more vivid, in spite of canting dilettantes, than from a railway train. But landscape on a walking tour is quite an accessory. He who is indeed of the brotherhood does not voyage in quest of the picturesque, but of certain jolly humours — of the hope and spirit with which the march begins at morning, and the peace and spiritual repletion of the evening’s rest. He cannot tell whether he puts his knapsack on, or takes it off, with more delight. The excitement of the departure puts him in key for that of the arrival. Whatever he does is not only a reward in itself, but will be further rewarded in the sequel; and so pleasure leads on to pleasure in an endless chain. It is this that so few can understand; they will either be always lounging or always at five miles an hour; they do not play off the one against the other, prepare all day for the evening, and all evening for the next day. Now, to be properly enjoyed, a walking tour should be gone upon alone. If you go in a company, or even in pairs, it is no longer a walking tour in anything but name; it is something else and more in the nature of a picnic. A walking tour should be gone upon alone, because freedom is of the essence; because you should be able to stop and go on, and follow this way or that, as the freak takes you; and because you must have your own pace, and neither trot alongside a champion walker, nor mince in time with a girl. And then you must be open to all impressions and let your thoughts take colour from what you see. You should be as a pipe for any wind to play upon. “I cannot see the wit,” says Hazlitt, “of walking and talking at the same time. When I am in the country I wish to vegetate like the country” — which is the gist of all that can be said upon the matter. There should be no cackle of voices at your elbow, to jar on the meditative silence of the morning. And so long as a man is reasoning he cannot surrender himself to that fine intoxication that comes of much motion in the open air, that begins in a sort of dazzle and sluggishness of the brain, and ends in a peace that passes comprehension. According to the passage, what is the primary purpose of a walking tour?