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.
A measure of whether you are a child of God or a pretender.....
GOD knows if you are a pretender. You are not fooling HIM. Maybe other people, but NOT the eternal GOD!
If you despise or hate a fellow believer, which is called your brother, you cannot be a believer.... It is a tell tale sign of whether you are saved or unsaved...