“Perhaps walking is best imagined as an 'indicator species,' to use an ecologist's term. An indicator species signifies the health of an ecosystem, and its endangerment or diminishment can be an early warning sign of systemic trouble. Walking is an indicator species for various kinds of freedom and pleasures: free time, free and alluring space, and unhindered bodies.”

“Musing takes place in a kind of meadowlands of the imagination, a part of the imagination that has not yet been plowed, developed, or put to any immediately practical use. [--] [T]ime spent there is not work time, yet without that time the mind becomes sterile, dull, domesticated. The fight for free space—for wilderness and for public space—must be accompanied by a fight for free time to spend wandering in that space.”

“...the gym is a kind of wildlife preserve for bodily exertion. A preserve protects species whose habitat is vanishing elsewhere, and the gym (and home gym) accommodates the survival of bodies after the abandonment of the original sites of bodily exertion.”

“The widespread abuse of prisoners is a virtually foolproof indication that politicians are trying to impose a system--whether political, religious or economic--that is rejected by large numbers of the people they are ruling. Just as ecologists define ecosystems by the presence of certain "indicator species" of plants and birds, torture is an indicator species of a regime that is engaged in a deeply anti-democratic project, even if that regime happens to have come to power through elections.”

“For [Jane Austen and the readers of Pride and Prejudice], as for Mr. Darcy, [Elizabeth Bennett's] solitary walks express the independence that literally takes the heroine out of the social sphere of the houses and their inhabitants, into a larger, lonelier world where she is free to think: walking articulates both physical and mental freedom.”

“Solitude in the city is about the lack of other people or rather their distance beyond a door or wall, but in remote places it isn’t an absence but the presence of something else, a kind of humming silence in which solitude seems as natural to your species as to any other, words strange rocks you may or may not turn over.”

“One of the functions of landscape it to correspond to, nurture, and provoke exploration of the landscape of the imagination. Space to walk is also space to think, and I think that's one thing landscapes give us: places to think longer, more uninterrupted thoughts or thoughts to a rhythm other than the staccato of navigating the city.”