"I do not refer here to the extreme feelings of the Left and Right. A people that has experienced all that the Germans have been through, naturally offers fertile soil for the extremists. The ballast in the center of the German ship which saved it from heavy rolling in the past, that valuable and steady middle class group, no longer exists. The uprooted saw their hope in a complete reversal of affairs. It was at this time that the great tide of Bolshevism broke over Germany, appearing on the left as Communism and on the right as National Socialism. That a nation, whose currency had collapsed, whose social and economic reorganization had been as ruthless as ours – that this nation, which had to learn to live in an entirely new situation, has been able to master Bolshevism of the Right and of the Left, shows the healthiness of its spirit, the zeal of its industriousness, and the victory of realpolitik over the imaginary and illusory."
January 1, 1970
https://en.wikiquote.org/wiki/Extremism