seeing is believing

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seeing is believing

  1. (idiomatic) You need to see something to believe it; visible facts cannot be denied.
    • 1712, John Arbuthnot, The History of John Bull:
      There's nothing like Matter of Fact; Seeing is Believing.
    • 1848, J. C. and A. W. Hare, Guesses at Truth, second edition, page 497:
      Seeing is believing, says the proverb. Though, of all our senses, the eyes are the most easily deceived, we believe them in preference to any other evidence.