I believe Adlai Stevenson paraphrased Goethe from Faust saying:
What you have inherited from your fathers, earn over again for yourselves or it will not be yours.Now is such a time. WW2 was not as bad as it gets; it was just another manifestation of man's inhumanity to man. It will happen again and again, and we must be prepared to meet the threat directly.
Take heart, my friends. We are born of great men and women who knew how to rise to the call of freedom. We will, too.