Envy

Whatever is out there, must be better than what I have. To envy is to sit apart and stare. To cast covetous eyes upon another life, another inanimate object, and wish bitterly it was yours.

It is human. We envy when life gets hard, when we are tired of the struggle, when suffering painful reverses; that's only natural. It becomes a problem when we sit upon and hatch our grievances until envy takes over our soul.
A cat hunched in a window, a fox looking up at grapes, the images are universal.