Actually -- and this might be why I like it -- it's not a speech, it's a sermon. I just plugged the great April 4, 1967 speech at Riverside Church on an IPA news release, which is not nearly as well known as it should be, but many activists do know about it. What fewer people know about is that after that speech and the establishment attack on King, he responded with successively stronger speeches (though I remember reading in one of his biographies that King cried when the New York Times attacked him). One of those speeches was at the Ebenezer Baptist Church on April 30, 1967. Much of the text is the same as Riverside, but he is somewhat more passionate there, perhaps more at home than at Riverside, but perhaps more importantly he attacks the establishment media:
Been a lot of applauding over the last few years. They applauded our total movement; they've applauded me. America and most of its newspapers applauded me in Montgomery. And I stood before thousands of Negroes getting ready to riot when my home was bombed and said, we can't do it this way. They applauded us in the sit-in movement--we non-violently decided to sit in at lunch counters. The applauded us on the Freedom Rides when we accepted blows without retaliation. They praised us in Albany and Birmingham and Selma, Alabama. Oh, the press was so noble in its applause, and so noble in its praise when I was saying, Be non-violent toward Bull Connor;when I was saying, Be non-violent toward [Selma, Alabama segregationist sheriff] Jim Clark. There's something strangely inconsistent about a nation and a press that will praise you when you say, Be non-violent toward Jim Clark, but will curse and damn you when you say, "Be non-violent toward little brown Vietnamese children. There's something wrong with that press!
There is one minor quibble I have with this sermon -- it ends with the lines "And nations will not rise up against nations, neither shall they study war anymore. And I don't know about you, I ain't gonna study war no more." But I think we do need to study war. We need to study war and all its destructiveness in excruciating detail. See text and audio of the sermon "Why I Am Opposed to the War in Vietnam" -- someone put excerpts of it (via my husseini.org I'm delighted to say) on YouTube and it's getting to one million views: