"Happiness lies in being privileged to work hard for long hours in doing whatever you think is worth doing...."

"Happiness lies in being privileged to work hard for long hours in doing whatever you think is worth doing.... Each man or woman must find for himself or herself that occupation in which hard work and long hours make him or her happy."

~ Robert Heinlein, talking through his character Jubal Harshaw in his novel To Sail Beyond the Sunset