Vienna was a hard school for me; but it taught me the most profound lessons of my life. I was scarcely more than a boy when I came to live there, and when I left it I had grown to be a man of a grave and pensive nature. In Vienna I acquired the foundations of a WELTANSCHAUUNG in general and developed a faculty for analysing political questions in particular. That WELTANSCHAUUNG and the political ideas then formed have never been abandoned, though they were expanded later on in some directions. It is only now that I can fully appreciate how valuable those years of apprenticeship were for me.