For me it is a very nice blend because both are in dire need for success, have one thing in common that is closely related. I think the good view you see from the positive side.
Being smart and being hardworking because those are positive attributes of a person. Working smart means you can come up with a better and new ideas that you will be working hard.
In current times, if someone is not a smart person, believe me he doesnt has any place in the world. Now, people become so sharp that they dont allow anyone to surpass them. So in case you want to extend your professionalism or work, you need to be smart and hard worker. These both attributes can help you take the mark and if even one is missing, you are just ruined up person.