When envy is present, strife will soon occur; this then opens the door to confusion and every evil work. The spirit of jealousy is what caused the first murder, so whenever we are jealous of another, in a sense we may wish that person dead. Envy occurs when we feel we have not been treated fairly. The way we can kill envy instead of allowing it to kill us is to humble ourselves.
We need to esteem others higher than ourselves. If we do, we will never be envious. Pride is the root of envy, and we destroy pride when we gladly take upon ourselves the form of a servant just as Jesus did. Life is not fair. Some people have more than others in intelligence, wealth, meaningful relationships, etc. God is just and merciful, however, and if you determine to humble yourself under the mighty hand of God, He promises to lift you up.
At the foot of the cross, we are all at the same level. We need to remain at the foot of the cross daily, and envy will never invade our lives to destroy it.