this is quite a philosophical question.  jung suggested a collective unconsciousness runs throughout all people, allowing everyone to have similar beliefs, for example, in a higher being.  i personally believe we're born with a soul (what you call nature).  within that soul, God has given us free will.  for most of us, our souls also contain consciences.  as we grow up, our family members, friends, neighbors, society in general start molding our personalities.  the choices we make start playing a role as well.  we can choose one route and end up 'good'.  we can choose another route and end up 'bad' or 'evil'.  either way, we (our souls, as it were) are directed by that 'something' you mention.  it is either good or evil.  along with free will, our consciences direct the paths we take.  being raised in an environment where morality and virtues are taught can lead one to develop a conscience that seeks to do what's correct and good and loving and kind. for those whose souls have underdeveloped or no consciences, even if raised in the aforementioned environment, he/she can choose the alternative life to live, one that chooses greed over generosity, fear over calm, hate over love,  death over life, wickedness over good.  these are the two forces working against each other now: good versus evil.