Yesterday was his 83rd birthday. In school, most of us read the edited half-version of this speech. If you have never seen the full 17 minute version, I recommend that you take some time to do so now. Pay special attention to what happens about 11 minutes into the speech: he stops looking at his notes.
He wasn’t martyred for being a nice guy and singing ‘Kumbaya’. He was an agitator for equality who shook the powers in their high places. He is still singing ‘We Shall Overcome’.