1) work is never ending process, you can never finish work.
2) Interest of client is not more important than your family.
3) if you fail in life your boss or client will not be the person to offer a helping hand but your family or friends will do.
4) Life does not mean coming to office, going home and sleeping There is more to a life. you need a time to socialize, entertainment, exercise and relaxation. Dont make your life meaningless.
5) A person who sits in office till late is not a hardworking person, but he/she is a fool who doesn't know how to finish work in simulated time. Beside he is a loser in life who doesn't have personal or social life.
6) you did not study hard and struggle in life to be a machine and live a meaning less life.
7) if your boss forces you to work late then forward this to him too. he will try to make his life meaningless too.