The words set the tone for Douglass' texts and speeches, which allow the audience that listens to feel the sentiment he feels as he presents those words.
We can arrive at this answer because:
To find out what is a text's tone, it is necessary to read it and identify what the author's intentions were with that text.
You didn't show the passage to which the question refers, which makes it impossible for me to provide a specific answer, but I hope the information above will help you.
More information on what the tone of a text is:
https://brainly.com/question/17958197