What is the meaning of "the superior man blames himself. it is the inferior man who blames others."

This means that a better person would blame himself when something goes wrong. By doing this you are committing to being a better person and owning up to the truth. When you blame someone else it shows that you are scared of realizing that you could have done better. When saying someone else did something wrong, you are saying that you are perfect. You are not.