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The similarities in the physiological characteristics of Leopardi and Nietzsche are especially remarkable. The same sensitivity toward weather and seasons, toward place and environment, are found in both. Leopardi feels the slightest change in the thermometer and barometer. He could create only during the summer; he traveled about, always looking for the most suitable location for his creative activity. Nietzsche expresses himself about such peculiarities of his nature in the following manner: “Now after long practice, when I observe the effects of climatic and meteorological nature upon myself, as upon a very delicate and reliable instrument, and after a short journey, perhaps from Turin to Milan, calculate the change in the degree of humidity calculated physiologically in myself, then I look with horror at the sinister fact that my life until the last ten years, the most dangerous years, has always been spent in locations treacherous and absolutely forbidden to me. Naumburg, Schulpforta, Thuringia, in fact, Bonn, Liepzig, Basel, Venice, — all of them places of misfortune for my physiology. ...” Connected with this unusual sensitivity in Leopardi as well as in Nietzsche, is a contempt for all altruistic feelings. Both of them had to overcome this in order to be able to tolerate mankind. From Nietzsche's own words one can see that his shyness in presence of strong impressions, of attractions which demand too much of his sensitivity, fill him with suspicion toward selfless impulses.
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