From his speech "Why I am opposed to the war in Vietnam."
It is time for all people of conscience to call upon America to come back home. Come home, America. Omar Khayyam is right: "The moving finger writes, and having writ moves on." I call on Washington today. I call on every man and woman of good will all over America today. I call on the young men of America who must make a choice today to take a stand on this issue. Tomorrow may be too late. The book may close. And don't let anybody make you think that God chose America as his divine, messianic force to be a sort of policeman of the whole world. God has a way of standing before the nations with judgment, and it seems that I can hear God saying to America, "You're too arrogant! And if you don't change your ways, I will rise up and break the backbone of your power, and I'll place it in the hands of a nation that doesn't even know my name."
Martin Luther King Jr