The word "duty" is a clue here, and the word "result" is misunderstood. It is asking you to do what must be done, but to be modest in what you expect as return.

The word "duty" is a clue here, and the word "result" is misunderstood. It is asking you to do what must be done, but to be modest in what you expect as return. It is rather close to the definition of integrity: To do the right thing, even when nobody's looking.