“I learned the value of hard work by working hard.”

Nicholas Sparks, Chapter 11, p. 187
2000s, Three Weeks with My Brother (2004)
Source: Three Weeks With My Brother

Herald Sun staff (October 13, 2006) "A good life, naturally", Herald Sun, p. 017.

As quoted in The Leadership Secrets of Colin Powell (2003) by Oren Harari, p. 164.
2000s

Chapter 124 http://books.google.com/books?id=61W3aGvTVgIC&q=%22Beware+of+the+man+who+works+hard+to+learn+something+learns+it+and+finds+himself+no+wiser+than+before%22&pg=PA281#v=onepage: Frank's Ant Farm
Cat's Cradle (1963)

Source: Dilbert's Guide to the Rest of Your Life: Dispatches from Cubicleland

Speech to the Commonwealth Club of California (19 May 1992)
Commonwealth Club speech

Source: The Importance of Being Earnest and Other Plays

I began a work the motif of which is the river bank in the direction of St. Paul's Church. Looking towards Rouen I have before me all the houses on the quays lighted by the morning sun, in the background the stone bridge, to the left the island with its houses, factories, boats, launches, to the right a mass of pinnaces of all colors.. .Yesterday, not having the sun, I began another work on the same motif in grey weather, only I looked more to the right [603]. I must leave you for my motif. I have a room on the street. I shall start on a view of the street in fog for it has been foggy every morning until eleven o'clock—noon. It should be interesting, the square in the fog, the tramways, the goings and comings..
Quote in a letter, Rouen 11 October 1883, to his son Lucien; from Camille Pissarro - Letters to His Son Lucien ed. John Rewald, with assistance of Lucien Pissarro; from the unpublished French letters; transl. Lionel Abel; Pantheon Books Inc. New York, second edition, 1943, p. 40
1880's