The 15¢ Black Heritage stamp on this envelope is from those first issued on January 13, 1979, honoring Martin Luther King Jr. and his work. The envelope has a handwritten message from Jesse Jackson Sr. that states, “Keep Hope Alive! Peace!” King, a Baptist minister, Nobel Prize winner, and civil rights leader, became a major voice during the civil rights movement. During the March on Washington in 1963, King delivered his “I Have a Dream” speech, which would come to be regarded as one of the greatest speeches in American history. The power of King’s language was drawn from the Bible, and included quotes and references from Isaiah, Amos, Psalms, and Galatians.