One who does good is of God:

3 John 11

11 Beloved, do not imitate what is evil, but what is good. The one who does good is of God; the one who does evil has not seen God.

            Little children like to imitate their fathers or mothers. Those not born of God imitate their father the devil. We are born of God, so we should be imitating our Father by doing what is good. You can tell who is of God. They are consistently doing good. If someone is consistently doing evil, that person most likely is not born of God. We are not to judge one another, but as someone once said, “We are to be fruit inspectors.” If someone is not bringing forth good fruits, it’s unlikely that person is a Christian. We should be very careful in our association with that person. That doesn’t mean to avoid them, but don’t let your guard down. Those that profess to be Christians but don’t live the lifestyle of a Christian can most easily bring down a true Christian. They can bring temptation that is hard for believers that are not well grounded to resist. Christians aren’t tempted to do “really bad things” like robbing banks, but they could be tempted to take a little something that belongs to the company they work for especially when “everyone is doing it”.

If you could hear God speak to you, I believe this is what He would say:

            "My children, when you are of Me, then you will behave like Me. I am good, and those that are Mine are also good. There is no one who is of Me that is not good. You will know those that are Mine by the way they act. If they act like Me, then they are Mine. If they act like their father the devil, then they are not Mine.”

            28. I am born of God. Therefore I will imitate what is good. I will do what I see my Father doing.