No More Learning

For we do not thereby take knowledge of the
nature of our souls, nor of the           world, nor of the Supreme
Being, with respect to what they are in themselves, but we have merely
combined the conceptions of them in the practical concept of the
summum bonum as the object of our will, and this altogether a
priori, but only by means of the moral law, and merely in reference to
it, in respect of the object which it commands.