And although, if we take into account the intended function of the clock, we can say that, when it fails to indicate the time correctly, it has fallen away from its nature; and likewise, if we consider the machine of the human body as designed so as to enable the movements that usually take place in it, I may think that it has gone astray from its own nature if its throat is dry at a time when drink will not conduce to its preservation, yet I can see perfectly clearly that this latter meaning of 'nature' is quite different from the former.