In the analytical part of the critique it is proved that space and time are only forms of sensible intuition, and therefore only conditions of the existence of the things as appearances, further that we have no concepts of the understanding and hence no elements for the cognition of things except insofar as an intuition can be given corresponding to these concepts, consequently that we can have cognition of no object as a thing in itself, but only insofar as it is an objectb of sensible intuition, ie as an appearance; from which follows the limitation of all even possible speculative cognition of reason to mere objects of experience.