How could I know that he or she is GOOD OR BAD

How could i know that he or she is a good or bad?

I can tell when he or she is good or bad depends on its feeling .If he or she is angry it might be a bad person.Because if the person is mad, it might be beating people up and other people will be hurt or badly injured.If the person is good,it must have a smile on everyone and heor she must say thank you for the people that helped him before.But sometimes ,if he or she is mad it does not mean that the person is bad, sometimes it might be good.Also if he or she is kind, it does not mean it is a good person, it might be a bad person.Sometimes the person is good and bad as it has been very attentive to who the person is talking and another way to say is to say that it could not be attntive to the person that is talking him or her.If I would to choose, I will choose the kinnd one as him or heer is very attentive,and he or she is GOOOOOOOOD!!!!!!!!!!!! Thank you about my things!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!