Human mind lies in two ranges, simple and complicated. A person with complicated mindset will have a difficult time ahead. They review everything with a negative note. On the contrary, a person with a simple mind will have a positive outlook and get things done quickly.
Our whole life (work,life,business and everything else) depends upon the outlook we have towards things around us. A simple person can make complicated things simple, while a complicated person can't make complicated things simple. A simple mind can accept things as it is and a complicated mind complains about everything that's happening around. Simply put, a balanced view is what is required.