a conscience is a made up word used to describe the complexity of human consciousness.

There really is no voice in the back of your head telling you what is right and wrong.

Right and wrong are dictated by what you are taught as a child, and by what is generally accepted by the society you live in. Its subjective, so in light to what I was saying, different people have very different definitions of what is wrong and right.

(At first I thought you were horribly misspelling consciousness, but it seems the whole time you were trying to say conscience)