I disagree with this article to a certain extent. A little jealousy can be a good thing. It can be good to want what someone else has when that leads to hard work and the eventual attaining of that goal. It becomes a negative when you want what someone else has, but don't think you can ever get it so just sit and stew in the doldrums. Children are so used to getting what they want right away and not having to work for it that as adults they are embittered by those who have what they want. A perfect example: The individual who worked and sacrificed to create a successful business and can now take time off to be with his family versus his employee saying he doesn't deserve to have that money or vacation time since I work harder than he does.