Flies are undeniably dangerous insects. Due to the close relationship between flies and humans, humans recognize that flies are dirty, disgusting insects and have great responsibility for the many diseases that are contagious in this life and cause death. 

Flies whose eyes are only focused on looking for dirty things in their lives are related to humans, who like to look for human ugliness even in the smallest of things. While the attitude of looking for badness and shame in people is a reprehensible attitude, this is no different than flies looking for dirty things to lay their eggs on. The attitude of people who often look for bad things in people is because they do not want to see others happy and have more sustenance than themselves. In humans, this also stems from an attitude of not being grateful and always looking for other people's sustenance that they don't have. While everything we have comes from the creator's will and what we have worked for in life.