http://www.gutenberg.org/files/1956/1956-h/1956-h.htm#link2H_4_0013 Walking for walking's sake may be as highly laudable and exemplary a thing as it is held to be by those who practise it. My objection to it is that it stops the brain. Many a man has professed to me that his brain never works so well as when he is swinging along the high road or over hill and dale.
Experience teaches me that whatever a fellow-guest may have of power to instruct or to amuse when he is sitting on a chair, or standing on a hearth-rug, quickly leaves him when he takes one out for a walk. The ideas that came so thick and fast to him in any room, where are they now? where that encyclopiedic knowledge which he bore so lightly?
where the kindling fancy that played like summer lightning over any topic that was started? The man's face that was so mobile is set now; gone is the light from his fine eyes.