We've all been there done that. And it never ends well. When peeking over at your neighbor, friend, loved one, even your competition, and comparing their success or material possessions with your lack thereof ~ you are really telling God He has failed.
Then there are the sour grapes.
And sour grapes make such a fine whine!
For there is no lack in God. He owns it all and would gladly give us what we need if we would ask with a pure heart and be capable of handling it. And even then He is God and knows what is best.
Instead of comparing, rejoice with others that they are having success, got a new car, or their life is going well. For when we can truly help one another and rejoice at their success, we might just be taking a step in the direction that will free up our own.