The attempt to combine wisdom and power has only rarely been successful, and then only for a short while.
 
[Dem Streben, Weisheit und Macht zu vereinigen, war nur selten und nur auf kurze Zeit Erfolg beschieden.]

Albert Einstein (1879-1955) German-American physicist
Essay (1953-05-23), “Aphorisms for Leo Baeck [Neun Aphorismen], No. 2, Essays Presented to Leo Baeck on the Occasion of His Eightieth Birthday (1954) [Einstein Archives 28-962]
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(Source (German))

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