A Week on the Concord and Merrimack Rivers http://www.gutenberg.org/dirs/etext03/7cncd10.txt (1849), Sunday
Henry David Thoreau: Zitate auf Englisch (seite 18)
Henry David Thoreau war US-amerikanischer Schriftsteller und Philosoph (1817-1862). Zitate auf Englisch.“None are so old as those who have outlived enthusiasm.”
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.
Misattributed
"I am a parcel of vain strivings tied", st. 6 (1841)
A Week on the Concord and Merrimack Rivers http://www.gutenberg.org/dirs/etext03/7cncd10.txt (1849), Sunday
“He would have left a Greek accent slanting the wrong way, and righted up a falling man.”
A Plea for Captain John Brown (1859)
Attributed to Thoreau, in The Life You Were Born to Live : A Guide to Finding Your Life Purpose (1995) by Dan Millman, p. xi, and to Ralph Waldo Emerson in Promotion of Pharmaceuticals : Issues, Trends, Options (1993) by Dev S. Pathak, Alan Escovitz, and Suzan Kucukarslan, p. 74, but no occurrence of it prior to the 1990s has been located.
Disputed
A Week on the Concord and Merrimack Rivers http://www.gutenberg.org/dirs/etext03/7cncd10.txt (1849), Friday
Letter to Harrison Gray Otis Blake (6&7 December 1856), as published in The Correspondence of Henry David Thoreau (1958), p. 444; a line within this has been most quoted since 1865 in the form "I am ready to try this for the next ten thousand years, and exhaust it."