It is better to have your head in the clouds, and know where you are, if indeed you cannot get it above them, than to breathe the clearer atmosphere below them, and think that you are in paradise.
Source:Letter to Harrison Blake (Concord, April 10, 1853); The Writings of Henry David Thoreau (Houghton, Mifflin and Co., ed. 1906), Volume VI, Page 218
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