Foundation and Fulcrum

Before Descartes lays the foundation of his theory, he develops a method.  Now, while the criterion of the former--Certainty--is explicit, that of the latter is not addressed.  But, it is implicit--Versatility, since the value of his method consists in its applicability to any belief.  Furthermore, since Versatility connotes Dynamism, characterizing it as the 'foundation', which connotes stability, of Cartesianism is inappropriate.  Instead, more suitable is 'fulcrum', which signifies, more accurately, that a project that seems to be of world-creation, is actually that of world-moving, i. e. a theory with practical consequences, including, notably, continued adherence to religious activity, threatened by the new Heliocentrism.  Likewise, while Descartes seems to be trying to build a castle in the air, his actual ambition is Archimedean--locating I Think outside the world, with I Am as his fulcrum.