None are so old as those who have outlived enthusiasm.

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Source, in full

First attributed to Thoreau in A year of sunshine: cheerful extracts for every day in the year‎ (Kate Sanborn, 1886) and American literature‎ (Mildred Cabell Watkins, 1894), but there is no known citation to Thoreau's works.

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Attribution

Quote text and notes from Wikiquote: Henry David Thoreau (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.