An Independent Orthodoxy
Rav Shimshon taught that in an age of civil liberty, Judaism can only gain from freedom if it develops independently, without giving implicit or explicit approval to efforts at reform. This principle, called Austritt, led him to hold that Orthodox Jews must separate from the Reform-dominated community.
Source: Das Princip der Gewissensfreiheit (1874); Der Austritt aus der Gemeinde (1876)