Joe Rigney at desiringgod.org wrote a great post on When Envy Turns Deadly.  Here Rigney walks through the deadly role envy played in the crucifixion of Jesus.  Envy is not a toy, it is not a neutral emotion, it is not something to be trifled with.  Envy is sin.  It is like a weed that will keep trying to come back no matter how many times you pull it out.  Envy needs to be regularly killed by the power of the Spirit and the Word.  

Check out Rigney’s post.  It will not disappoint.

http://www.desiringgod.org/blog/posts/when-envy-turns-deadly