1- "Let freedom ring from the prodigious hilltops of New Hampshire. Let freedom ring from the mighty mountains of New York." (alliteration)
This line uses alliteration with the repetition of the sound "f" in "freedom" and "from" which creates a sense of emphasis and urgency. As an audience member, this repetition would have added emphasis to the importance of freedom and the need for it to be heard and recognized from all corners of the country.
2- "I have a dream that my four little children will one day live in a nation where they will not be judged by the color of their skin but by the content of their character." (emotive language)
This line uses emotive language to convey the deep personal desire and hope of the speaker for a more just and equal society. As an audience member, this line would have been particularly moving and persuasive because it connects the idea of freedom and equality to the most innocent and vulnerable members of society - children. It would have been powerful to hear this call to action for a better future for all children, regardless of their race.