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sapere aude

American  
[suh-per-ay au-day, sah-per-ay au-day] / səˈpɛr eɪ ˈaʊ deɪ, ˈsɑ pər eɪ ˈaʊ deɪ /

phrase

Latin.
  1. dare to know; to think for oneself or seek understanding through reason.