1st John 3:9-10
9 Whosoever is born of God doth not commit sin; for his seed remaineth in him: and he cannot sin, because he is born of God.
10 In this the children of God are manifest, and the children of the devil: whosoever doeth not righteousness is not of God, neither he that loveth not his brother.
i haven't had a chance to be on in a while but i was reading over these verses and thought it was interesting that verse 9 said that whosoever is born of God does not commit sin and it is obvious it is referring to the fact that they do not commit sin not that it isn't imputed unto them. (if that's how you say it) what makes it so obvious is verse 10 where it says in this the children of God are manifested and the children of the devil. So it really is telling you how you can tell if someone's is of God or not. if it was what was inside someone's heart that manifested if they were of God or not we couldn't tell cuz we can not see inside someone's heart and these versus would not be in the bible cuz nothing would be manifested.