How does Roosevelt use the rhetorical device of antithesis to advance his purpose?

Roosevelt employs antithesis to contrast opposing ideas, thereby emphasizing the gravity of his message and the choices facing the nation. By juxtaposing concepts such as fear and courage, he highlights the importance of resilience and action in the face of adversity. This rhetorical strategy not only clarifies his vision for overcoming challenges but also galvanizes the audience to unite and take decisive steps forward. Ultimately, antithesis strengthens his persuasive appeal by underscoring the stakes involved in the decisions of the time.