Every job is different. I don't think that I've ever had that wonderful feeling when you've finished a job or where you feel like you've mastered it or sort of nailed it... You can never be satisfied. If you're satisfied, it's time to retire.

每个工作都不一样。当你完成了一项工作，或者你觉得自己已经掌握了它，或者差不多掌握了它的时候，我从来没有过那种美妙的感觉……你永远不会满足。如果你感到满意，是时候退休了。