In this context is is used as C useless articles.
Yet, I think that he feels a particular sadness of the state of affairs that envelop the modern body politic, "the unknown citizen." Auden sees a collusion between business, technology, and government as having reduced the complexity of the citizenry to patterned and predictable conformity.
Francie moves to Phoenix and a cactus grows in her yard.
Answer:
Romeo believes that dreams hold the secrets of his fate and destiny and therefore have great value.