viii.), and as no one endeavours to preserve his own being, except in accordance with the laws of his own nature, it follows, first, that the foundation of virtue is the endeavour to preserve one's own being, and that happiness consists in man's power of preserving his own being;
Hortik dator, lehenbizikorik, bere izan propioari atxikitzeko ahalegina bera dela bertutearen funtsa eta gizakiak bere izana atxiki ahal izatean datzala zoriona.