And this is the transcendental deduction of all the ideas of speculative reason, not as constitutive prin ciplesb for the extension of our cognition to more objects than experience can give, but as regulative principlesc for the systematic unity of the manifold of empirical cognition in general, through which this cognition, within its proper boundaries, is cultivated and corrected more than could happen without such ideas, through the mere use of the prin ciples of understanding.