Being envious is one of the ordinary human characteristics.
An envious person remains unhappy, because instead of enjoying what he has, he feels jealous of what others have. Furthermore, he desires to gain benefits, while depriving others of it. Besides this, the envious person poses illogical question to which he finds no answer. E.g comparing doctor duty with labor. In brief, envy can ruin any skill of a person. Therefore, the cure to envy is selflessness for saint and happiness for the ordinary man. But instead of curing, the envious person may argue that this cure is unimportant for him because he can not find happiness while feeling envious. Even envy is an obstacle to happiness itself.