III. Of the Reason for conceiving an End which is also a Duty

An end is an object of the free elective will, the idea of which determines this will to an action by which the object is produced. Accordingly every action has its end, and as no one can have an end without himself making the object of his elective will his end, hence to have some end of actions is an act of the freedom of the agent, not an affect of physical nature. Now, since this act which determines an end is a practical principle which commands not the means (therefore not conditionally) but the end itself (therefore unconditionally), hence it is a categorical imperative of pure practical reason and one, therefore, which combines a concept of duty with that of an end in general.

Now there must be such an end and a categorical imperative corresponding to it. For since there are free actions, there must also be ends to which as an object those actions are directed. Amongst these ends there must also be some which are at the same time (that is, by their very notion) duties. For if there were none such, then since no actions can be without an end, all ends which practical reason might have would be valid only as means to other ends, and a categorical imperative would be impossible; a supposition which destroys all moral philosophy.

Here, therefore, we treat not of ends which man actually makes to himself in accordance with the sensible impulses of his nature, but of objects of the free elective will under its own laws- objects which he ought to make his end. We may call the former technical (subjective), properly pragmatical, including the rules of prudence in the choice of its ends; but the latter we must call the moral (objective) doctrine of ends. This distinction is, however, superfluous here, since moral philosophy already by its very notion is clearly separated from the doctrine of physical nature (in the present instance, anthropology). The latter resting on empirical principles, whereas the moral doctrine of ends which treats of duties rests on principles given a priori in pure practical reason.