Abbey's literary influences included Aldo Leopold, Henry David Thoreau, Gary Snyder, Peter Kropotkin, and A. B. Guthrie, Jr.. Although often compared to authors like Thoreau or Aldo Leopold, Abbey did not wish to be known as a nature writer, saying that he didn't understand "why so many want to read about the world out-of-doors, when it's more interesting simply to go for a walk into the heart of it." The theme that most interested Abbey was that of the struggle for personal liberty against the totalitarian techno-industrial state, with wilderness being the backdrop in which this struggle took place. Most of Abbey's writing criticizes the park services and American society for its reliance on motor vehicles and technology. He wanted to preserve the wilderness as a refuge for humans and believed that modernization was making us forget what was truly important in life.