“Mankind’s biggest failure is its inability to learn from the mistakes of the past, and its silence in the face of atrocities committed against those without a voice.” Jana Petken, The German Half Bloods.
The first part of this quote parallels old definition of insanity “Doing things the same way and expecting a different outcome.”
Relative to the second part of this quote is from the saying by Edmund Burke who once said: “The only thing necessary for the triumph of evil is that good men should do nothing.” In 1770 this Irish statesman and philosopher Edmund Burke wrote about the need for good people to associate to oppose the cabals of bad people.