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

Essay (1953-05-23), “Aphorisms for Leo Baeck [Neun Aphorismen], No. 8, Essays Presented to Leo Baeck on the Occasion of His Eightieth Birthday (1954) [Einstein Archives 28-962]
    (Source)

Leo Baeck (1873-1956) was a noted a German rabbi, scholar, and theologian.

(Source (German)). Another 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.
[Source]