To think and act we have to trust things that go beyond what we can perceive or demonstrate. Our knowledge cannot be a mere summary of the evidence but must rest on something further—at a minimum, on a belief that future evidence will validate it. It is a system of coherent belief, and like any other cannot exist without tradition and thus faith. In the end, there are no skeptics. None of us can abandon faith without abandoning thought and life.
Reason and experience depend on an everyday kind of faith. We need that faith to tell us that our memories can be relied on, that the experience of others is like our own, even that things exist independently of us and our thoughts. Reason is not self-sustaining. It cannot demonstrate the conditions of its functioning: the validity of first principles, the coherence of memory, the trustworthiness of perception, or the reliability of the linguistic and cultural setting it needs to operate. To trust reason we must trust those things, and to trust experience we must trust both our perceptions and the thoughts that enable us to sort them out and come to grips with them. We understand tradition, the accumulated thought and experience of our people, much more by accepting it than by weighing and judging it from outside. We treat it as something that comes to us with an authority that goes beyond anything we can fully explain. Our confidence is based on faith that it is not random or arbitrary but revelatory, that through it the bits, pieces and glimmerings that are immediately available to us have grown into attitudes, practices, beliefs and symbols that show how things are and make truths available to us we could not attain directly.