God Answers Prayer as Only He Can

From this you perceive that we pray here not for a crust of bread or a temporal, perishable good, but for an eternal inestimable treasure and everything that God Himself possesses; which is far too great for any human heart to think of desiring if He had not Himself commanded us to pray for the same.  But because He is God, He also claims the honor of giving much more and more abundantly than any one can comprehend,*—like an eternal, unfailing fountain, which, the more it pours forth and overflows, the more it continues to give,—and He desires nothing more earnestly of us than that we ask much and great things of Him, and again is angry if we do not ask and pray confidently.†

Martin Luther, Large Catechism: Lord's Prayer, 55-56

* Ephesians 3:20
† Hebrews 4:16