The sigh of the search for knowledge.– “Oh, my greed! There is no selflessness in my soul but only an all-coveting self that would like to appropriate many individuals as so many additional pairs of eyes and hands–a self that would like to bring back the whole past, too, and that will not lose anything that it could possibly possess. Oh, my greed is a flame! Oh, that I might be reborn in a hundred beings!” –Whoever does not know this sigh from firsthand experience does not know the passion of the search for knowledge.