Humans are social creatures. It requires the presence of another human being. It was not a perfect man. It is precisely the presence of another human being makes perfect. A leader will never succeed alone. It can be a successful leader thanks to the success of those they lead. It can be successful because it can maximize the full potential of those they lead.
Leaders who failed not because his brain is not smart, but he could not optimize the competence of everyone in each level of the organization he leads. It can work hard to pursue success, but it will be worth it when you can not make everyone he leads work wholeheartedly, full capacity of thinking, full of skill and creativity, its full spirit.