The first time I heard about prayers that God won't answer, I was surprised.
There was a guy who was desperate to own a car before the new year, every effort he made to acquire one failed so he stepped up and bought the car. Do you believe that this guy died the second day in an accident?
Nothing is indeed too much for God to do and when he isn't, we should know that there is a reason for that.
God knows the end from the beginning. God's response is always, yes, no or wait. The problem is we don't always want to wait. We want everything quick without thinking of what God is preventing us from.
That's the problem with our world currently
Impatience of the highest order