There are continents and seas in the moral world, to which every man is an isthmus or inlet, yet unexplored by him.
Source: In Webster's Electronic Quotebase, ed. Keith Mohler, 1994.
-- Henry David Thoreau, (Jul 12 1817-1862), US essayist, poet, naturalist; He is best known for his description of life at Walden Pond, Walden, 1854 and his essay Civil Disobedience, 1849.