Can you summarize the following document?
        
  

  起初,納粹抓共產黨人的時候,我沉默了,因為我不是共產黨人。當他們抓猶太人的時候,我沉默了,因為我不是猶太人。當他們抓工會成員的時候,我沉默了,因為我不是工會成員。當他們抓天主教人的時候,我沉默了,因為我不是天主教人。最後當他們來抓我時,再也沒有人站起來為我說話了。

  英語:THEY CAME FIRST for the Communists,and I didn't speak up because I wasn't a Communist.THEN THEY CAME for the Jews,and I didn't speak up because I wasn't a Jew.THEN THEY CAME for the trade unionists,and I didn't speak up because I wasn't a trade unionist.THEN THEY CAME for the Catholics,and I didn't speak up because I was a Protestant.THEN THEY CAME for me,and by that time no one was left to speak up.

  英語: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.
起初他們......(英語:First they came...)是德國著名神學家兼信義宗牧師馬丁·尼莫拉的一篇二戰過後的懺悔文,該文以詩為體裁呈現,1946年首先以德文寫成。描述德國的知識分子與牧師屈服於納粹勢力,幫助納粹肅清一群又一群的無辜者。該詩意旨在闡明無視與自己無關的團體所造成的結果,且後來常被引用,作為對不關心政治的人之呼籲。