Canada Month, June 1963. A later satirical version of this saying added to the end "Luckily, this is not difficult" (Paul Dickson, The Official Rules [1978]). See Eleanor Roosevelt 2
Louisa May Alcott (2016). “LITTLE WOMEN SERIES – Complete Collection: Little Women, Good Wives, Little Men & Jo's Boys: The Beloved Classics of American Literature: The coming-of-age series based on the author’s own childhood experiences with her three sisters”, p.402, e-artnow (Open Publishing)