Working smartly is the key to be successful in life these days. You should know when and where you should put your efforts. Over doing a task with not much monetary value will only exhaust you and won't be fruitful. You should be able to prioritize tasks and then work smartly to achieve the desired results.
For me being smart can help you do your job smoothly. Hardwork on the other way is needed in doing your job smartly. They are both interconnected that needs to be balance in achieving positive outcome in our works success.