Duty is one and invariable; it requires no impossibilities, nor can it ever be disregarded with impunity.
Henry David Thoreau (2017). “HENRY DAVID THOREAU - Ultimate Collection: 6 Books, 26 Essays & 60+ Poems, Including Translations. Biographies & Letters (Illustrated): Walden, The Maine Woods, Cape Cod, A Yankee in Canada, Canoeing in the Wilderness, Civil Disobedience, Slavery in Massachusetts, Life Without Principle, Excursions, Poems of Nature, Familiar Letters…”, p.1936, e-artnow
