Hitler himself said:
"Today I want to be a prophet once more: if international Jewry succeeds in plunging the nations into another world war, the result will not be the Bolshevization of the earth, and thereby the victory of Jewry, but the destruction of the Jewish race in Europe!"
web.archive.org
". . . [T]he war will not end as the Jews imagine it will, namely with the uprooting of the Aryans, but the result of this war will be the complete annihilation of the Jews. Now for the first time they will not bleed other people to death, but for the first time the old Jewish law of an eye for an eye, a tooth for a tooth, will be applied. And – world Jewry may as well know this – the further these battles [of the war] spread, the more anti-Semitism will spread. It will find nourishment in every prison camp and in every family when it discovers the ultimate reason for the sacrifices it has to make. And the hour will come when the most evil universal enemy of all time will be finished, as least for a thousand years."
worldfuturefund.org
Himmler has said:
"I also want to refer here very frankly to a very difficult matter. We can now very openly talk about this among ourselves, and yet we will never discuss this publicly. Just as we did not hesitate on June 30, 1934, to perform our duty as ordered and put comrades who had failed up against the wall and execute them, we also never spoke about it, nor will we ever speak about it. Let us thank God that we had within us enough self-evident fortitude never to discuss it among us, and we never talked about it. Every one of us was horrified, and yet every one clearly understood that we would do it next time, when the order is given and when it becomes necessary.
I am now referring to the evacuation of the Jews, to the extermination of the Jewish people."