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You can find further interviews with contemporary witnesses at http://www.zeitzeugen-portal.de about "periods", "topics" or "people". Despite all the influences of the time, he always applied Christian values as the most important yardstick - in society and politics. The professor of Christian social teaching was involved throughout his life in debates about the most important controversial issues in German post-war history. No matter how radical his theses and views may have been, he stood up for his convictions regardless of any criticism. (Rights: © ZDF)