What's the greatest speech you've ever heard in your lifetime? Think about it for a minute. For some people a great speech and a great speaker spring to mind without any hesitation just because they were so memorable.
Take, for example, Rev. Martin Luther King, Jr.'s speech on the steps of the Lincoln Memorial in 1963. We know it as his "I Have A Dream" speech. We revisit that moment every year on Dr. King's birthday and we can hear it any time on YouTube. It's accessible electronically in a way that most other historic speeches, say, Lincoln's Gettysburg Address, are not. So what made that speech great? Why does it touch us in a way that few other speeches in our history have? What did Dr. King say that was so special?