There are many variations of the saying - several from himself, but the best known version goes:

  First 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 for me.

[Edit 1] Removed editorialization.

[Edit 2] Reverted it. Isn't that what this whole discussion is about? Being able to say unpopular things?

So, do people use the same quote about how the German government banned Nazi symbols in the aftermath of that?

Oh wait, no they don't. I wonder why that might be.

I, for one, do not look forward to an internet where the only allowable form of humor is some combination of popsicle stick jokes and regurgitated memes.

Humour can be offensive. Some great humour is.

Not all humour is offensive. Some great humour isn't.

And when humour is offensive, it's pretty widely agreed that it should "punch up" and never "punch down".