When you say that you agree to a thing in principle you mean that you have not the slightest intention of carrying it out.
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About Otto von Bismarck
Otto von Bismarck was German chancellor of germany from 1871 to 1890. Otto Eduard Leopold, Prince of Bismarck, Count of Bismarck-Schönhausen, Duke of Lauenburg was a German statesman and diplomat who oversaw the unification of Germany and served as its first chancellor from 1871 to 1890. Bismarck's Realpolitik and firm governance resulted in his being popularly known as the Iron Chancellor. Read more on Wikipedia →