Answer and Explanation:
Hello. Since it is not possible to access page 281 of your book, this answer may be a little inaccurate, but I hope I will help you.
All the rhetorical resources used by Lincoln in his speeches, had as main objective, to create a discourse rich of information, which had the capacity to move the public to different aspects and tried to expose true, deep and proven arguments, through all the details of support and evidence.
All of this impacts the public in different ways, but all positive, stimulating the public's support for what is being talked about. Lincoln knew how to do this with mastery and for that reason, his speeches are remembered today, as speeches of great social impact.