Unthinking respect for authority is the greatest enemy of truth.
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Citation
Einstein, Albert. "To Jost Winteler." The Collected Papers of Albert Einstein, vol. 1: The Early Years, 1879-1902, English Translation Supplement, translated by Anna Beck. Princeton University Press, 1987, no. 115. Originally from Letter to Jost Winteler, 8 July 1901.