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The sentiment above is a nice thought on focus. And that's how the quote is often used, including by yours truly. We love focus. Focus is important; you can't hit your targets without being able to sight them.
But focus is only half the story and quote (literally.) Thoreau's coda is "...therefore, though they should fail immediately, they had better aim at something high."
A romantic sentiment, beautifully expressed. But is Thoreau's quote espousing a good business principle? Is it the big picture that matters? Is vision is more important than accomplishment?
We've looked at the both the "vision thing" and "failure is the best path to success" before, and found a fixation on either, to the exclusion of the other, somewhat problematic.