The sentence expressed by Atticus mopstra that we should not judge people on the basis of our own concepts. This is because each individual has their own problems, visions, beliefs and experiences that shape the way they operate within society. These factors are often not known to everyone, but that does not mean that they do not exist.
An example of this that is related to my life, occurs when I tend to imagine that women who live in relationships, highly abusive and destructive beings continue to live this situation because they want to. I cannot judge them, since I do not know the real factors and situations that compel them to live like this, I would only know, if I were in their place and I am not.
Therefore, we must try to understand people before judging them and if it is not possible to understand them we must not draw conclusions based on our life or our own knowledge, because each one knows what he is going through and how it affects him.