Power.

Why do we all have the need for power? Our best way to achieve greatness is trough power, but why do we need greatness? And what is power? Someone said that knowledge is power, but in order to get knowledge, we need money. So money equals power and then again power equals money. But when does this end? And why do we need all this? Just to show someone that we are somebody, that we can do something great. But what greatness brings us? Almost all great people are known by their power or money. So greatness brings money. But how do we become great? And why?