The sun is rising. Belief can never be authenticated. It can be defended through reaction, it can be strengthened through conditioning, it can be expanded through coercion, but belief can never know if it is true or not. Belief can never take the risk that it will find out that it is, in fact, false. This inherent insecurity is why belief is so destructive and has historically made religion one of the great sources of conflict.
Faith is what results from belief allowing itself to be questioned, examined, tested.
When belief is placed in that fire, the impurities are burned off and what is left is faith. Faith is not afraid of questions or challenge. It is not concerned with convincing. Faith is absolute. It is the substratum of the relative world of belief.