Whoever undertakes to set himself up as a judge of Truth and Knowledge is shipwrecked by the laughter of the gods.

[Wer es unternimmt, auf dem Gebiet der Wahrheit und der Erkenntnis als Autoritat aufzutreten, scheitert am Gelachter der Gotter.]

Albert Einstein (1879-1955) German-American physicist

“Neun Aphorismen” (23 May 1953), Essays Presented to Leo Baeck on the Occasion of His Eightieth Birthday (1954) [Einstein Archives 28-962]
    (Source)

Original German. Alternate translation: "He who endeavors to present himself as an authority in matters of truth and cognition, will be wrecked by the laughter of the gods."