Final answer:
Johnson uses repetition to emphasize the elements of the Great Society, invoke a sense of citizen responsibility, and challenge his audience to continue the nation's progress.
Step-by-step explanation:
Johnson uses repetition as a rhetorical strategy to emphasize certain aspects of the Great Society he envisions. The repetition of the clause "It is a place" adds emphasis to the various facets of the Great Society, making the concept memorable and significant. He also uses this repetition to define what he means by a Great Society, highlighting the values of culture, connection with nature, reverence for beauty, and community.
Furthermore, his reference to the personal pronoun "your" invokes a sense of responsibility among the citizens to partake in the creation and success of this society. This usage directly involves the audience in the participatory process of nation-building. By stating "I do not agree" in response to the counterclaim that the battle for a soulful society cannot be won, Johnson directly involves his audience, suggesting that their will and labor are essential to building the kind of society that aligns with older values and new visions.
The reference to the word "century" helps set the historical context of the nation's development and the progress needed for a prosperous future, while challenging his audience to envision their role in this ongoing process.