The grand assertion is that you must see the world through probability and that probability is the only guide you need. - Dennis Lindley

Whatever way uncertainty is approached, probability is the only sound way to think about it.

It is not surprising that in talking about uncertainty we should lean heavily on facts, just as the court of law does when interrogating witnesses. Facts form a sort of bedrock on which we can build the shifting sands of uncertainty.

Consider the case of a person who holds a view with probability 1. Then coherence says that it is no use having a debate with them because nothing will change their mind.