If I were to name the 3 most precious resources of life, I should say books, friends, and nature; and the greatest of these, at least the most constant and always at hand, is nature.
Source: In The Speaker's Electronic Reference Collection, AApex Software, 1994.
-- John Burroughs, (Apr 3 1837-1921), US author, naturalist; He was a popular writer who, like Thoreau, celebrated nature in Wake Robin, 1871 and Birds and Poets, 1877.