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By March he was reading—or at least recalling—Mme de Stael’s Germany (1812), that widely read introduction to German thought and culture. Mme de Stael ends her book with three strong chapters on “enthusiasm” which, she said, was the leading, all-important characteristic of the Germans. It was, in her view, the one indispensable key to the subject. What the Germans had taught her, they also taught Thoreau: “Thought is nothing without enthusiasm.”8
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Robert D. Richardson Jr. (Henry Thoreau: A Life of the Mind)