Oneness Quotes (page 60)
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One farmer says to me, 'You cannot live on vegetable food solely, for it furnishes nothing to make bones with;' and so he religiously devotes a part of his day to supplying his system with the raw material of bones; walking all the while he talks behind his oxen, which, with vegetable-made bones, jerk him and his lumbering plow along in spite of every obstacle.
Henry David Thoreau