"There is no abstract Evil; you have to understand that! Its roots are here, all around us, in this herd that goes on chewing and having a good time only an hour after a murder! That's what you have to fight for. For people. Evil is a hydra with many heads, and the more of them you cut off, the more it grows! Hydras have to be starved to death, do you understand that? Kill a hundred Dark Ones, and a thousand more will take their place."

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At a time when threats to the physical environment have never been greater, it may be tempting to believe that people need to be mounting the barricades rather than asking abstract questions about the human place in nature. Yet without confronting such questions, it will be hard to know which barricades to mount, and harder still to persuade large numbers of people to mount them with us. To protect the nature that is all around us, we must think long and hard about the nature we carry inside our heads.

— William Cronon