there is happiness and there is sadness..then there is anger and frustration.....all of them have a functionality..they keep the wheel of life moving alright..they take you up and then bring you down so in the end it is a zero sum game really, ain't it.
but then there is the stoic. she doesn't feel if she does not have to.. that is his functionality. for him, it is not a zero sum game eventually. she can do the sacrifice of the self when she has to so as to focus on the most important task at hand. then, it is not a zero sum game eventually..!