The discussions of every age are filled with the issues on which its leading schools of thought differ. But the general intellectual atmosphere of the time is always determined by the views on which the opposing schools agree. They become the unspoken presuppositions of all thought, and common and unquestioningly accepted foundations on which all discussion proceeds.

Studies on the Abuse and Decline of Reason: Text and Documents (ed. Routledge, 2010) - ISBN: 9780415573832