There is a proper measure in all things, certain limits beyond which and short of which right is not to be found. Who so cultivates the golden mean avoids the poverty of a hovel and the envy of a palace.
We envy only those whom we feel ourselves to be like; we envy only members of our reference group. There are few successes more unendurable than those of our close friends.
Sympathy is what you have for someone after they die, pity you have for someone when they don't have a date to the biggest dance of the year. Empathy is what I do to you when you judge me. Envy is having pity on yourself. Can you discern the rest for yourself?