The kind of faith the Writings are talking about is a faith that is lived, a faith that goes hand in hand with the life of religion. When the Lord was on earth, the faith that healed so many people was what the Writings call a miraculous faith. But a belief that is just in the mind, or, for that matter, a belief that is just in the heart, will not save. Saving faith is a faith that is lived. It goes forth into action.
Faith has no power apart from charity, and apart from the effort to live the life of religion.
But if you are making that effort, if you are trying, but you are feeling discouraged, then remember the power of faith. He told them that if, when they prayed, they believed that they would receive what they asked for, then they would receive it. But, on the spiritual plane, such wonderful things do occur. If you have within yourself an evil that you love, an evil that seems as large and as immovable as a mountain, and if you are doing all that you can to fight against it, and are doing all that you can to live a life of good, but are not succeeding, then have faith. Have faith in the Lord.