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
George Carlin (2015). “3 x Carlin: An Orgy of George including Brain Droppings, Napalm and Silly Putty, and When Will Jesus Bring the Pork Chops?”, p.550, Hachette UK