The knowledge that Cassandra possesses, the knowledge of the future, is useless, because no one believes her prophecies. Knowledge is not mutually inclusive or exclusive of belief. Knowledge without faith is absent. Believing without knowledge is naivety. The presence of beliefs without knowledge leads to reckless actions. Being motivated by false things will make any resulting action wrong. The opposite is also true. When knowledge is present without belief, there is nothing because belief is necessary for action to occur. The belief that a difference will be made inspires action, and not believing that anything will change means nothing will be done. In the first stanza Cassandra highlights this phenomenon. She knows the future, but has a "head full of doubts" that leads her to do nothing to prevent her prediction of death from arriving.