Critique of Practical Reason - Immanual Kant  ## Metadata - Author: **Immanual Kant** - Full Title: Critique of Practical Reason - Category: #books ## Highlights - For the will stands between its à priori principle, which is formal, and its à posteriori spring, which is material - Tags: #philosophy - Supposing, however, that there were something whose existence has in itself an absolute worth, something which, being an end in itself, could be a source of definite laws, then in this and this alone would lie the source of a possible categorical imperative, i. e. a practical law.