Dorian Gray's quote

"Each of us has heaven and hell in him"

I think it's a very intelligent quote, and totally true. Each one of us have a good part and a bad part, but always one of them has more priority and that let us know if it's  good or a bad person.

Good people have sometimes bad attitudy, and bad people are not always bad. Like a quote in Spanish(ni los buenos son tan buenos ni los malos son tan malos) say: good persons are not so good and bad persons are not so bad. We can see it at Dorian Gray, he isn't so bad how we think.

So, I think we must search for a perfect harmony between both to have a correct personality. This harmony will always be tendentious to the positivity.