 His liberalism is especially radical in that it advocates virtually unrestricted freedom of thought and expression (including freedom of worship). He has several reasons for this position: (1) He feels that such freedom belongs to people’s moral dignity. (2) He believes that it is essential for individuals’ self-realization. (3) He believes that people’s capacities for discerning the truth are very limited and that it is only through a constant contest between opposing viewpoints that the cause of truth gets advanced. (John Stuart Mill would later borrow from these considerations—largely via Wilhelm von Humboldt—to form the core of his own case for freedom of thought and expression in On Liberty.)