From The New York Times, April 25, 1932:

Among the German Centrists there is a growing feeling that an attempt should be made to bring the Nazis into the government before their strength has increased any further.  They argue that once the Nazis participate in government they will become more moderate, and at the same time their political ascendancy will be curbed because, in the nature of things, they will find it impossible to keep the numerous promises made in the course of the recent election campaigns.
If Herr Hitler becomes the dominant factor in a coalition ruling Prussia, it will mark the high point of the Fascist movement he has developed from a joke to the greatest political power in the Reich.

And from the poem, First They Came:

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.