Being is that in which subjectivity is self-certainty, and this excludes everything else belonging to experience. The confusion of this kind of self-certainty with mathematical certainty, whether of logic or of axioms, is what leads to the error of Cartesianism. It is a natural and perhaps necessary mistake, but must be let go. The challenge is to build something, anything out of that true certainty. It is self-certainty and not certainty of the self. The 'I' may function for a time as a pointer, a gesture to realign it, but apart from that is only a structure in the imagination no different from any other object.