PROP. XXXVIII. Whatsoever disposes the human body, so as to render it capable of being affected in an increased number of ways, or of affecting external bodies in an increased number of ways, is useful to man; and is so, in proportion as the body is thereby rendered more capable of being affected or affecting other bodies in an increased number of ways;
Zerk ere giza Gorputza modu anitzez hunkitua izatera egokitzen baitu edo kanpoko gorputzak modu anitzez hunkitzeko gai egiten, hura onuragarri zaio gizakiari, zenbat eta gehiago Gorputza gai egiten baitu modu anitzez hunkitua izateko edo beste gorputzak modu anitzez hunkitzeko, hainbat eta onuragarriago; kaltegarri zaio, aldiz, Gorputza hartarako gaitasun gutiagokoa egiten duena.