I think in general one has to have an inner serenity and that is achieved by being active and to be satisfied with one’s action. To be satisfied with own action implies that one knows exactly which action is being taken. This can, however, be actions which are not morally defendable but the person who does the action is still satisfied. It is unfortunate, but these categories also fall under action where a person may get inner serenity.
When one is satisfied envy often disappears. I believe this due to the fact one no longer care about others. By this, I don’t mean that one does not care about other human beings but rather. One is glad about his or her own and whatever others have is of no concern. The action we take results in some outcome. If one knows the outcome and result of the action are desired outcome, then there is a satisfaction on that action. For instance, if one wishes a new car, one takes a second job or work harder to get more money to get a new car. Of course, it is not always as simple as that. Unfortunately, some people have the feeling of envy in their blood. It has always been a kind of mystery for me why some people, envy others so much but I have come to understand that sometimes this is a person’s nature.
Let’s say your neighbor has a castle as a house and an expensive car. You invite him to your house for a cup of coffee and he sees your expensive coffee maker. If it is in his nature, he would envy you, although he has enough money to buy the coffee maker immediately.
There is a Swedish joke. A genie comes to a Swedish person and tells him that he can wish whatever he wishes, and he will grant it, but his neighbor will get twice as much as him. The Swedish guy thinks a while and says, please kill one of my cows. This joke maybe is funny but, in some sense, shows human nature. Romantic jealousy, however, has no boundaries and there is no medicine against. Deep inside if one cares about another person, it is natural that one gets jealous. A healthy dose of it is Ok but excessive will kill the romance and love.
Think about it, do you use to envy others?