Ambition?

Ambition, the motivation of the world, allowing people to complete their life dreams, and maybe even better the world; but is it always a positive thing? I believe not, ambition just as it is, is a good thing, having the drive and motivation to do the things you want. However, there is a point when that ambition can just become pure insanity. When Ambition turns negatively, for example, when someone wants a position of power so badly that do immoral, or illegal things to get that position, this is when ambition is no longer a positive thing. Negative ambition may never go as far as murder, or coup, but certain immoral acts revolving around ambition could lead to it.