I look up the meaning of envy on my computer's dictionary and it says:
a feeling of discontented or resentful longing aroused by someone else's possessions, qualities, or luck .
Aha! Longing! Envy is a longing. And we know from a few posts ago, that longing is connected to being static. Thus, envy is static. It leads to a self-regarding loop that collapses in on itself. Nothing beautiful can come out of it.