Now since no existenceb of objects of the senses can be cognized fully a priori, but always only comparatively a priori relative to another already given existence, but since nevertheless even then we can only arrive at an existence that must contained somewhere in the nexus of experience of which the given perception is a part, the necessity of existenced can thus never be cognized from concepts but rather always only from the connection with that which is perceived, in accordance with general laws of experience.