  The expression “continental rationalism” refers to a set of views more or less shared by a number of philosophers active on the European continent during the latter two thirds of the seventeenth century and the beginning of the eighteenth. Rationalism is most often characterized as an epistemological position. On this view, to be a rationalist requires at least one of the following: (1) a privileging of reason and intuition over sensation and experience, (2) regarding all or most ideas as innate rather than adventitious, (3) an emphasis on certain rather than merely probable knowledge as the goal of enquiry. While all of the continental rationalists meet one or more of these criteria, this is arguably the consequence of a deeper tie that binds them together—that is, a metaphysical commitment to the reality of substance, and, in particular, to substance as an underlying principle of unity.