Envy is that thing that makes you wish you had what other people had, it's that discontentment with what you have. Asaph, the writer of Psalm 73 goes into a testimonial experience of how envy almost wrecked him, until he went into the presence of God to see things with a Godly lens. Envy is destructing and it's key to refocus your mind on God instead of looking at other people. Often what we see in others isn't fully what's there.