Envy or jealousy is like crab mentalityPeople who want to catch crabs use a pot which has its bottom but is open on upper side. It has no cover. The crabs can go through this open part. When the pot is full it is covered with a cover and put aside.
The noticeable thing is that the crabs can go out of the pot because it was opened but they did not do so because one crab wants to go out the other crabs catch it try to stop to go out. This process goes on till the pot is full. So no crab is able to go out of the pot and they are caught in the pot.
The same rule applies on the people who are envious or jealous. They never progress and not allows to other to progress.