The paper proposes the principles that have regulated high finance in Milan in the years from 1925 to 1973 period that delimits the professional life of Raffaele Mattioli, one of the most important, if not the most important Italian banker. The rescue of Banca Commerciale Italiana is carried out while maintaining its position as the largest national institution. The banker takes the lead over the careless management that had led to the financial crisis in the 1930s, oversees its recovery and leads it to a new development. Past mistakes are overcome by the separation of commercial and financial credit. His Comit supports the large enterprises without forgetting the small and medium-sized ones which in more recent times he sees more lively. His corporate culture proposes a banker who selflessly uses expertise and morality to serve the common good.