Examples

Martin Luther King's speech //I Have a Dream:// > I have a dream today. I have a dream that one day the state of Alabama, whose governor's lips are presently dripping with the words of interposition and nullification, will be transformed into a situation where little black boys and black girls will be able to join hands with little white boys and white girls and walk together as sisters and brothers. I have a dream today. I have a dream that one day every valley shall be exalted, every hill and mountain shall be made low, the rough places will be made plain, and the crooked places will be made straight, and the glory of the Lord shall be revealed, and all flesh shall see it together."
 * "I have a dream that one day this nation will rise up and live out the true meaning of its creed: "We hold these truths to be self-evident: that all men are created equal." I have a dream that one day on the red hills of Georgia the sons of former slaves and the sons of former slave owners will be able to sit down together at a table of brotherhood. I have a dream that one day even the state of Mississippi, a desert state, sweltering with the heat of injustice and oppression, will be transformed into an oasis of freedom and justice. I have a dream that my four 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.
 * He repeats this phrase because he wants to describe what could happen in America, not just what people dream about. He is using this to show everyone that he is ready to take action against all the hatred and the racism towards African Americans.

Charles Dickens novel //A Tale of Two Cities//
 * It was the best of times, it was the worst of times, it was the age of wisdom, it was the age of foolishness, it was the epoch of belief, it was the epoch of incredulity, it was the season of Light, it was the season of Darkness, it was the spring of hope, it was the winter of despair, we had everything before us, we had nothing before us, we were all going direct to Heaven, we were all going direct the other way...
 * Charles Dickens uses this to interest the reader and lock them into the book. This quote is from the beginning of the book so he wants to draw in the readers attention already. If the quote was just it was the best of times, the worst of times, the age of wisdom... it would not be as appealing. It would be more of a list of what was going on. When he keeps saying "it was the..." he draws in the attention of the reader.

//Night// by Elie Wiesel
 * "Never shall I forget that night, the first night in camp, which has turned my life into one long night, seven times cursed and seven times sealed. Never shall I forget that smoke. Never shall I forget the little faces of the children, whose bodies I saw turned into wreaths of smoke beneath a silent blue sky. Never shall I forget those flames which consumed my faith forever. Never shall I forget that nocturnal silence which deprived me, for all eternity, of the desire to live. Never shall I forget those moments which murdered my God and my soul and turned my dreams to dust. Never shall I forget these things, even if I am condemned to live as long as God Himself. Never."
 * Elie Wiesel uses "never shall i forget" as a way to describe the pain and hurt he felt inside from the Holocaust. It is a way to share his pain with the readers. Never shall i forget is repeated to express how unforgettable this incident was and how he will basically be scarred for life.