The categories of the second class (those of causality and of the necessity of a thing) did not at all require this homogeneity (of the conditioned and the conditioned in the synthesis), because here the intuition was to be presented not as it is assembl from a manifold in it, but only insofar as the existence of the conditioned object corresponding to it is added to the existence of the condition (added, as connected with this existence, in the understanding); and there it was permitted to posit, for the thorough determined in the world of sense, the unconditioned although otherwise undetermined in the intelligible world