And wether or not that person is a credible source. MLK describes "Five score years ago a great American in whose symbolic shadow we stand today signed the Emancipation Proclamation. This momentous decree is a great beacon light of hope to millions of Negro slaves who had been seared in the flames of withering injustice." Through this quote, the audience of the speech can conclude that Martin Luther King, Jr. is well-educated on the subject of African-American history and has a passionate, well-founded opinion on the topic based on facts and historical