The average academic essay should contain the introduction, body, and conclusion, making sure the body has more text than the introduction or conclusion, as it is the bodyof a text, and should make up for the majority of the essay itself. The introduction is basically the first impression to an essay and should have a hook to keep the reader engaged. The conclusion should sum up some of the body of text, and overall conclude the essay itself.
The main purpose of Luther's speech was to persuade the audience to work towards ending the racial discrimination. Additionally, it inspired and brought hope to the people that one day discrimination can be abolished.