From The Duke's Children, Chapter 25, by Anthony Trollope|
"As far as my experience goes, the happiest man is he who, being above the troubles which money brings, has his hands the fullest of work. If I were to name the class of men whose lives are spent with the most thorough enjoyment, I think I should name that of barristers who are in large practice and also in Parliament."
"Isn't it a great grind, sir?" asked Silverbridge.
"A very great grind, as you call it. And there may be the grind and not the success. But [...] it is the grind that makes the happiness. To feel that your hours are filled to overflowing, that you can barely steal minutes enough for sleep, that the welfare of many is entrusted to you, that the world looks on and approves, that some good is always being done to others — above all things some good to your country — that is happiness. For myself I can conceive none other."