Maybe the key test for biographers is whether they can list their subject’s failures. Here’s Henry Seidel Canby’s list for Thoreau:
Failure with his friends, failure to discover the great secret, failure to reach a satisfactory stopping place in his studies of detail, failure to make up his mind how to use his thousands of pages of mixed notebook, essay, and poetic philosophy, troubled him but never disturbed the essential joy in experience. It did not need fame, or even a certainty of achievement, to make him a very happy man in his relations with nature …. He observed, first of all I should say, because he liked to do so.
The “great secret” was the quest to find the Transcendental — some spiritual reality behind nature. That project made Thoreau’s observations less scientifically useful than they might have been, at least if your science is biology. But Thoreau, to the extent that he was interested in science, was more anthropologist than biologist. He was more interested in natural places as the home or habitat of people. He began by looking for forces in nature that shaped people.
Eventually, he was just looking, just paying attention to what was there, without worrying much about what might be behind it.
Thoreau recorded the details of the place he knew. He was aware that a lot of his neighbors hardly noticed it. There was no universal agreement about the place. There was no Transcendental reality behind it, at least as far as Thoreau could see. But he found that the place was worth his attention. He didn’t need a reason to go look.
• Source: Henry Seidel Canby, Thoreau; Boston: Beacon Press, 1958, pp. 335-6.