"Justice rolls down like waters and righteousness like a mighty stream."
King quotes the bible. As a pastor, his faith in God is powerful. He is credible and persuasive because he has experience. He explains the issues of people today and the dehumanizing of what African Americans have to go through. His faith in God allows Christians to put more faith in him.
"But 100 years later, the Negro still is not free; 100 years later, the life of the Negro is still sadly crippled by the manacles of segregation and the chains of discrimination; 100 years later, the Negro lives on a lonely island of poverty in the midst of a vast ocean of material prosperity..."
King uses figurative language and anaphoras to express his feelings on how unjust and wrong it is that 100 years later African Americans are still neglected and dehumanized for the color of their skin. Despite heightened emotions, King uses his words to captivate the audience and start a civil rights movement.
"Five score years ago, a great American, in whose symbolic shadow we stand today, signed the Emancipation Proclamation."
King uses the Emancipation Proclamation as historic evidence. He uses this document to show the years of discrimination towards the black community. He speaks to encourage the people of the changes that need to be made. King preaches for equal rights and uses facts to get the audience to trust him and what he stands for.