Pros :
• It teaches you empathy.
• Envy gets your brain juices flowing.
• It is a good motivator.
• It reveals your next step. You have to actually know what you want to get there, right?
• Envy can make your mind wonder.
• Red flags can come up and you get a reality check.
Cons :
• lash out physically at the person who is smarter, more handsome (or prettier), has more money, is better educated, has more friends, etc;
• tells lies to others about the object of one’s envy, so that they lose their friends, their spouse or significant other or even their job;
• play mind games with the object of one’s envy, causing mental stress for that person. In other words, bully them;
• Steal the stuff of the person (or even their identity)
• Sooner or later you might get very mad at the person you really envy and want to torture the person; kill the person
• Jealousy/envy weakens your mental health.