Envy is an intense emotion. If it's entertained in the mind, and ultimately yielded to, a demonic spirit will come in and influence a person to commit heinous acts. Envy and hatred are closely related. They carries a desire to cause harm, suffering and pain to others.
We visibly see envy manifesting through people throughout our world. The person with envy wants what another has and resents them for having it. This would include desiring a person’s success, possessions, relationships, position, money and the like which if not resisted, will result in anger, bitterness, hatred, violence and even murder.