actually, everybody is a bit dr Jekill and Mr Hyde. really, everybody has two faces good and evil.... Does your sentence have a sense in English.

"In us all there are two separate sides That which is evil and that which is good Some people live by one side and others by the second Both of them have a little bit of the other But it must remain clear that the two depend on each other Remember, evil is a part of the good and not the opposite There is no sadness without joy and there is no joy without pain" The Evil Urge - Orphand Land

Your translation was not bad. I would change it for "bottom line, we all have a part of us/our heart that's good/nice and a part that's bad/mean/evil"

"Qu'est-ce que cela veut dire" à la place de "qu'est ce que ce dit"? c'est vrai mais on essaye toujours de faire parraître le bon en soi. n'est-ce pas? a_a

yes ! not sometimes ,but forever!