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Yes, i understand that Martin Luther King Jr. said this, but he was saying Napoleons words.
During his early months at Alcatraz, Capone made an enemy by showing his disregard for the prison social order when he cut in line while prisoners were waiting for a haircut. James Lucas, a Texas bank robber serving 30 years, reportedly confronted the former syndicate leader and told him to get back at the end of the line. When Capone asked if he knew who he was, Lucas reportedly grabbed a pair of the barber's scissors and, holding them to Capone's neck, answered “Yeah, I know who you are, greaseball. And if you don't get back to the end of that fucking line, I'm gonna know who you were.”
Original is German from this talk.
“Wenn man einen Gegner hat, muss man erst zuhören, ob er wirklich ein Gegner ist oder bloß eine andere Sprache spricht”
Hans-Peter Dürr was a coworker of Werner Heisenberg and became a pacifist after experiencing World War 2 as a German child soldier. He is often making explaining connections between humans, language and the meaning of science and physics.