Critique of Judgement by Immanuel Kant Chapter 63 Page 6

(as in Minorca) the ass or pig for ploughing — yet we cannot even here assume a relative natural purpose. For his Reason knows how to give things a conformity with his own arbitrary fancies for which he was not at all predestined by nature. Only, if we assume that men are to live upon the earth, then the means must be there without which they could not exist as animals, and even as rational animals (in however low a degree of rationality); and thereupon those natural things, which are indispensable in this regard, must be considered as natural purposes.

We can hence easily see that external purposiveness (advantage of one thing in respect of others) can be regarded as an external natural purpose only under the condition, that the existence of that [being], to which it is