We pray for things we want. So, what do we do if God says no? Can He say no? What if we're "the persistent widow" and are faithful in prayer? Then He has to say yes, right? I used to kind of think that, but Sunday's sermon made me rethink it.
Jesus asked three times not to have to go to the Cross, and He still had to go.
Paul asked three times for the thorn in the flesh to be removed, and God didn't take it away.
God works in mysterious ways, and we'll understand it better by and by. :)