Hardworking is a definitely a key to success. However, IMO smart work is the real key to success. A laborer worksvery hard, a slave works very hard to please his master but this sort of hard work is not the key to be successful. I think everyone should work wisely. In fact, continuous assessment of own working can make one successful. The motto of life should be "work hard, work wisely ".
RE: Breaking Paradigms, A Difficult Yet Necessary Task For Growth - Chapter 1