The corruption of the best things gives rise to the worst.
David Hume (1711-1776) Scottish philosopher, economist, historian, empiricist
The Natural History of Religion, ch. 10 “With Regard to Courage or Abasement” (1757)
(Source)
Hume actually calls this "the vulgar observation," an English translation of the well-known Latin phrase corruptio optimi pessima.
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