He wanted us to think of Prayer Simply as the means to an end, and that the Answer was to be the Proof that we and our Prayer are Acceptable to the Father in Heaven.
The Father intends the Answer to be the Token of His Favor and of the Reality of our Fellowship with Him.
Today your servant has known that I have found grace in your eyes, my lord, O king, in that the king has done the word of his servant. 2 Samuel 14.22