This is from Elisabeth Elliott... thought provoking stuff!!
"The answer to that depends on one's definition of work. It is necessary to know what a thing is for in order to judge whether it works. It would be senseless, for example, to say that if a screwdriver fails to drive nails into a board it doesn't "work." A screwdriver works very well for driving screws. Often we expect to arrange things according to our whims by praying about them, and when the arrangement fails to materialize we conclude that prayer doesn't work. God wants our willing cooperation in the bringing in of his kingdom. If "Thy kingdom come" is an honest prayer, we will seek to ask for whatever contributes to that end. What, after all is said and done, do you want above all? Is it "Thy will be done"? If so, leave it to Him.
Is it "My will be done"? Don't waste your time and God's by praying. Have it your way."