Allow me to pose four definitions that relate an individual to his perspective on his circumstances:
Contentment: Being happy with the things one cannot improve.
Ungratefulness: Being unhappy with the things one cannot improve.
Laziness: Accepting the things one can improve.
Ambition: Working to better the things one can improve.
Naturally, the best combination is that of contentment and ambition—being happy with what one cannot change, while working to better the things one can. So really, the only thing we have to decide is what can be improved and what cannot?
Contentment: Being happy with the things one cannot improve.
Ungratefulness: Being unhappy with the things one cannot improve.
Laziness: Accepting the things one can improve.
Ambition: Working to better the things one can improve.
Naturally, the best combination is that of contentment and ambition—being happy with what one cannot change, while working to better the things one can. So really, the only thing we have to decide is what can be improved and what cannot?