Perhaps you feel that God did let you down at some time in your life, or that one of His promises did not come true for you. If so, I urge you to realize that God doesn't always work within our time frame or in the ways that we would choose, but if you continue to trust Him, you will see the goodness of God in your life. Trust God at all times, and never give up. This is one of the ways that we can be faithful to God, as He is to us.