Some decide to devote the same amount of time to writing as to reading. Thoreau, Emerson recalls, had made it a principle to give no more time to writing than he had to walking. To avoid the pitfalls of culture and libraries; for otherwise, what one writes is filled with the writing of others. For all that those others in turn had written on the books of yet others … Writing ought to be this: testimony to a wordless, living experience. No the commentary on another book, not the exegesis of another text. The book as witness … but witness in the sense of the baton in a relay race. Thus does the book, born out of experience, refer to that experience.
— Frederic Gros, A Philosophy of Walking