We have always been told that hard work pays off (yeah, right), that it is noticed (so they can pile on more work) and appreciated (but don't you dare ask for a raise).
This needs to be the new mantra for the working class;
It is not my job or responsibility to compensate for the fact that this company hasn't hired enough people to keep this company/department running and I will not sacrice or destroy my mind or body to do so.