Prof. Dr. Guido Knopp, ZDF- Contemporary History, Author 

"The 20th century was as fascinating as terrible —  a century which burdened more good than evil to the people and gave more than any other century before: more sorrow and death, but also more welfare and more progress. It was the century of opposites: of Einstein and Hitler, of  Majdanek and the landing on the moon, of wars and desire for peace, moments of great luck  and days of desperation. The century of ideologies which wanted to make the world happy, no matter if it wanted it or not, and which only led it into disaster: inhumane utopias, which terribly failed in the end: from fashism further to communism. A century of two omens: Hiroshima. Since the  nuclear Big Bang over Japan we know: humanity is - materially and technically - able to extinct itself. Auschwitz has shown: It is morally able for that.

Let us hope, that this knowledge about self-extinction may contribute to sustain peace. Peace not  through human reason alone. Peace through fear from ourselves, too."