Envy

Everybody experience it. The envy. Why it comes?
Is it good?
I think, it is outcome of good :)
Good happen with someone else.
But why we feel envy?
It's certainly related to 'Self esteem'
Self esteem is certainly the thing, which is created by your self. And which is not having any practical meaning.
Your world is created by you. It's very hard to imagine. You create the world from beliefs. Not from memories, not from learning, not from listening. These all things are temporary and they exist for very short time. They just create 'belief'. And I think that our brain can't handle so many beliefs.. it overwrites the beliefs.
There are very less number of things, which we get at any present moment. I mean to say the information, which our body receives at any moment is very small..it's less than 1% of total information at any moment present in our surrounding, and as moment passes , it vanishes. I heard that brain can only remember last 7 things at a time. Not more than that..
So we are having only 7 things with us at any moment...