Faith illustrations are useful to understand covenant theology and how the Spirit of God works Christ in the soul. There are a lot of processes that go on. When defining the covenant of grace, it is these processes that we are describing. Process and faith begins with the 12 Elements of the Gospel, it is then carried by our priesthood and made effectual by the Spirit. The knowledge of this world is not clean, it defiles the soul. God uses truth as a filter, to remove from our thinking processes knowledge that does not represent Him. When we say that faith needs an action, or when we want to see faith in action, we can see it illustrated here. From the cycles of our growth to the virtue of His fruit, the process of faith is easily understood.