It creates a reassuring tone is the correct answer.
Explanation:
Franklin Delano Roosevelt was an American president from 1933 to 1945, when he died. He was in charge during the majority of the Great Depression. He also implemented the New Deal to face the Great Depression in a different way. As stated in the question, the excerpt belongs to his Inaugural Address where he talked about the then-ongoing situation.
The formal language helps creates a reassuring tone, meaning that he wanted to restore confidence in the new government and how they would face the Great Depression. He also uses a simile (an explicit comparison) to explain that they could overcome any difficult situation as they had done in the past.
