First impressions

Judging a person’s character quickly, based on the first impression that one has about her or him the person (based on first impressions), is never a good thing to do. It will always lead to wrong impressions about that person. For this reason, I never judge anyone or draw conclusions about someone I (have) just met. There is a saying in my country that summarizes this topic: “you cannot judge a book by its cover”, in other words it implies that you cannot give an opinion on a book unless you have read it all entirely. It is the same when it comes to expressing an opinion on a person. One is only entitled to express an opinion on his or her character about a person when one has known that person for a long time.
For example, one can meet someone for the first time when that person <em>[which person?] </em>is stressed, angry or angered by something that just happened, and might think <em>[who is doing the thinking?] </em>that that person <em>[?]</em> is not nice at all, without taking into account the fact that it <em>[what? the bad mood or the process of meeting someone for the first time?]</em> could be an uncommon event. On the contrary, one can meet a person that seems to be happy and nice, but it this could just be hypocrisy. It is really difficult to tell whether a person is a hypocrite or not based on a the first impression.
All in all, I think that judging a person while taking only into account only the first impression leads to the development of stereotypes and even promote racism racist thoughts. That (This) is why, I think one should not rush to give an opinion on anyone without first having spoken to that person for a long time .