A source of bad conscience, however, is the knowledge that my way of life, austere though it may appear to the richer folk, is still ruinously exploitive of nature -- not in my backyard, where I practice harmlessness toward even the wasps, but in the atmosphere, where my fossil fuel combustion's carbon dioxide is helping change the climate; in all those mountainous places where the metals and minerals that structure and drive my American life are torn from the earth; and in the flesh of fish and birds, mammals, and reptiles, where the chemicals that made the paper and plastic I use bioaccumulate, deforming reproduction. That guilty knowledge is another argument for material simplicity. The less I consume, the less harm I do to that which I love. In a consumer society, harmless living may be simple, but it is not easy. I make no claim to exemplary harmlessness or simplicity.

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When human beings have been fascinated by the contemplation of their own hearts, the more intricate biological pattern of the female has become a model for the artist, the mystic, and the saint. When mankind turns instead to what can be done, altered, built, invented, in the outer world, all natural properties of men, animals, or metals become handicaps to be altered rather than clues to be followed.

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You may melt your metals and cast them into the most beautiful moulds you can; they will never excite me like the forms which this molten eart...

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Shun idleness is the rust that attaches itself to the most brilliant metals.

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As well might it be said that, because we are ignorant of the laws by which metals are produced and trees developed, we cannot know anything of the origin of steamships and railways.

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