Book excerpt: Speeches of visionaries and great leaders who inspired change and influenced the course of history. Every speech marks a figure or moment in history that represents political or social transformation. A thoughtful compilation of orations from revered figures with whom most readers are already familiar: Mother Theresa, Thomas Paine, Galileo, Bill Gates, Susan B. Anthony, Martin Luther King, Jr., Winston Churchill, Ronald Reagan, Chief Seattle, and Barack Obama, to name a few.