His place of defense will be the fortress of rocks; his bread will be given him; his water will be sure.Isaiah 33:16
Christian, do you doubt whether God will fulfill His promise? Will the fortresses of rock be swept away by a storm? Will the storehouses of heaven fail? Do you think that your heavenly Father, even though He knows that you need food and clothes, will forget you? When not a sparrow falls to the ground without your Father's knowledge, and the very hairs of your head are all numbered, will you mistrust and doubt Him? Perhaps your affliction will continue upon you until you dare to trust God, and then it will end.
There have been many who have been tried and troubled until at last they have been driven in sheer desperation to exercise faith in God, and the moment of their faith has been the instant of their deliverance; they have seen whether God would keep His promise or not. So I urge you, doubt Him no longer! Do not please Satan, and do not trouble yourself by indulging any more those hard thoughts of God. Do not imagine that it is a small matter to doubt Jehovah. Remember, it is a sin; and not a little sin either, but in the highest degree criminal. The angels never doubted Him, nor the devils either.
We alone, out of all the beings whom God has fashioned, dishonor Him by unbelief and tarnish His honor by mistrust. Shame on us for this! Our God does not deserve to be so poorly treated; in our past life we have proved Him to be true and faithful to His word, and with so many instances of His love and of His kindness as we have received and are daily receiving at His hands, it is base and inexcusable that we allow a doubt to lodge within our heart. From now on let us resolve to wage constant war against doubts of our God—enemies to our peace and to His honor—and with an unstaggering faith believe that what He has promised He will also perform. "I believe; help my unbelief!"1
1) Mark 9:24