"Our loving Father does not wish any child of his to have one moment's anxiety or one unsatisfied need. No matter how great our need may be, no matter how numerous our requirements, if we only "prove him" in the manner he bids us, we shall never have room enough to receive all the blessing he will give (Malachi 3:10).
...Why is it we find it so hard to trust him? Has he ever failed us? Has he not said over and over and over again that he will grant all petitions offered out of a pure heart, "in his name"? "Ask of me"; "Pray"; "Prove me"; "Try me." The Bible is full of answers to prayer - wonderful answers, miraculous answers - and yet somehow our faith fails us, and we dishonour God by distrusting him!"
From The Kneeling Christian by An Unknown Christian