The Trumpet that Shall Never Call Retreat

Not as famous as some of his other speeches but one of the great ones.  He gave the speech on March 25, 1965 after leading a march of 25,000 from Selma to Montgomery Alabama.  Of his many life lessons, it must also be said that students of rhetoric would do well to spend a very, very long time listening, reading and thinking about speeches by Reverend Dr. Martin Luther King and his other writing.  There is a transcript here.