Think about the rhetorical devices in King's speech. Which device had the strongest effects?

Martin
Luther King, Jr., used many rhetorical devices in his "I Have a Dream" speech,
including tone, , figurative language, repetition, , and allusions. To choose one device that
made his speech most effective is difficult; each person would have to decide which one touches
him or her the most. 

For me, one of the most moving parts of the speech is
near the beginning where he combines anto the Declaration of Independence with theof the
"promissory note." This metaphor calls upon ethos (appeal to authority), logos (appeal
to reason), and pathos (appeal to emotions) all at once. 

In a sense we have come to our nations Capital to cash a check. When the architects of
our republic wrote the magnificent words of the Constitution and the Declaration of
Independence, they were signing a promissory note to which every American was to fall
heir.

This note was a promise that all men would be guaranteed the
inalienable rights of life, liberty, and the pursuit of...