Because, not knowing the real constitution on which sensation, power of motion, and reasoning, with that peculiar shape, depend, and whereby they are united together in the same subject, there are very few other qualities with which we can perceive them to have a necessary connexion: and therefore we cannot with certainty affirm: That all men sleep by intervals; That no man can be nourished by wood or stones; That all men will be poisoned by hemlock:
Hau bada gizaki espeziearen ideia abstraktua eta, beraz, esentzia, ideia hau ordezkatuz proposizio orokor ziur oso gutxi egin ahal izanen ditugu, zeren forma bereziarekin batera sentimena, higimena eta arrazoimena menpe dituen eta subjektu berean batzen dituen osaera erreala ezagutzen ez dugunez, beste koalitate oso gutxi hautematen ditugu haiekin beharrezko lotura dutenak eta, beraz, ezin dugu ziurtasunez baieztatu hauetako ezer: