How is it possible to understand the evil and the good in the world? How can you know the difference between evil and good? On what do you base your answer? I found myself thinking about the difference between good and evil, and I was trying to comparea the two different terms and I could not find a definition of what good is or evil is, is like morals, you cannot based them on feelings or in a universal code for all. Plato defines evil as the lack of goodness. The duality theory states that evil cannot exist withouth good, and good cannot exist without evil. The way I can understand these two terms is by understanding that something evil cause harm, while a good action cause or brings a satisfactory feeling. If Humanity is more attracted to a desire of good, what are the reasons that lead to one's choice in performing evil acts?