The radical changes in constitutional doctrine imply radical changes in internal legal culture; but these in turn are reflexes of radical changes in external legal culture, the culture of the educated community, of business and political leaders, and indeed, of the public at large. The Constitution, in fact, is always interpreted (and necessarily so) in the light of ruling ideas of the times. The Justices may make use of general social norms either consciously or unconsciously; because of the standardized and formalistic style in which Supreme Court decisions are written, it is not easy to know the level of awareness of the Justices or the way in which they conceive of their judicial role.