First they came for the Communists And I did not speak out Because I was not a Communist

Then they came for the Socialists And I did not speak out Because I was not a Socialist

Then they came for the trade unionists And I did not speak out Because I was not a trade unionist

Then they came for the Jews And I did not speak out Because I was not a Jew

Then they came for me And there was no one left To speak out for me

I never liked this quote, because it makes help a matter of anticipated reciprocal help rather than simply a good thing to do. Besides, memories are short.