When we think deeply about ourselves, all people had ever made mistake, all people have either negative or positive side, we ever hurt someone else and vise versa
But sometimes we forget that thing. We often make judgement to our friend that we think he/she has done something wrong or something hurt us. Then we give the negative predicate for him/her, without trying to find the reason why he/she did it.
But yes…. that’s our negative side 
)
So what do we have to do ?! It’s our challenge…;)
