It took me better than a quarter century to learn, the hard way, that hard work at something you want to be doing is the most fun that you can have out of bed . . . to learn that the smart man finds ways to make everything he does be work; to learn that "leisure" time is truly pleasurable (indeed tolerable) only to the extent that is its subconscious grazing for information with which to infuse newer, better work.
Spider Robinson