Critique of Practical Reason
Immanual Kant
For the will stands between its à priori principle, which is formal, and its à posteriori spring, which is material
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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.