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" Kant distinguished between two types of truths: (1) analytic propositions, which derive from logic and “reason itself” rather than from observing the world; for example, all bachelors are unmarried, two plus two equals four, and the angles of a triangle always add up to 180 degrees; and (2) synthetic propositions, which are based on experience and observations; for example, Munich is bigger than Bern, all swans are white. Synthetic propositions could be revised by new empirical evidence, but not analytic ones. We may discover a black swan but not a married bachelor or (at least so Kant thought) a triangle with 181 degrees. As Einstein said of Kant’s first category of truths: “This is held to be the case, for example, in the propositions of geometry and in the principle of causality. These and certain other types of knowledge… do not previously have to be gained from sense data, in other words they are a priori knowledge.” Einstein "
― Walter Isaacson , Einstein: His Life and Universe
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" Close to forty thousand Germans gathered in front of Berlin’s opera house on May 10, 1933, as a parade of swastika-wearing students and beer-hall thugs carrying torches tossed books into a huge bonfire. Ordinary citizens poured forth carrying volumes looted from libraries and private homes. “Jewish intellectualism is dead,” propaganda minister Joseph Goebbels, his face fiery, yelled from the podium. “The German soul can again express itself.” What happened in Germany in 1933 was not just a brutality perpetrated by thuggish leaders and abetted by ignorant mobs. It was also, as Einstein described, “the utter failure of the so-called intellectual aristocracy.” Einstein and other Jews were ousted from what had been among the world’s greatest citadels of open-minded inquiry, and those who remained did little to resist. It represented the triumph of the ilk of Philipp Lenard, Einstein’s longtime anti-Semitic baiter, who was named by Hitler to be the new chief of Aryan science. “We must recognize that it is unworthy of a German to be the intellectual follower of a Jew,” Lenard exulted that May. “Heil Hitler!” It would be a dozen years before Allied troops would fight their way in and oust him from that role.41 Le "
― Walter Isaacson , Einstein: His Life and Universe