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" Nature,” on the original planet, had meant what was not controlled by human beings. “Nature” was what was substantially previous to control, the raw material for control, or what had escaped from control. Thus the areas of Dichew where few people lived, quadrants that were undesirably dry or cold or steep, had been called “nature,” “wilderness,” or “nature preserves.” In these areas lived the animals, which were also called “natural” or “wild.” And all the “animal” functions of the human body were therefore “natural” — eating, drinking, pissing, shitting, sex, reflex, sleep, shouting, and going off like a siren when somebody licked your clitoris. "
― Ursula K. Le Guin , The Birthday of the World and Other Stories (Hainish Cycle, #9)
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" No matter how you civilised it, the body remained somewhat wild, or savage, or natural. It had to keep up its animal functions, or die. It could never be fully tamed, fully controlled. Even plants, Luis learned from listening to Hsing’s father, however manipulated to serve their symbiotic functions, were not totally predictable or obedient; and the bacteria populations came up constantly with “wild” breeds, possibly dangerous mutations. The only things that could be perfectly controlled were inanimate, the matter of the world, the elements and compounds, solid, liquid, or gas, and the artifacts made from them.
What about the controller, the civiliser itself, the mind? Was it civilised? Did it control itself? "
― Ursula K. Le Guin , The Birthday of the World and Other Stories (Hainish Cycle, #9)