for thou hast had experience of many wanderings without having found happiness anywhere,— not in syllogisms, nor in wealth, nor in reputation, nor in enjoyment, nor anywhere. Where is it then? In doing what man's nature requires. How then shall a man do this? If he has principles from which come his affects and his acts. What principles? Those which relate to good and bad: the belief that there is nothing good for man which does not make him just, temperate, manly, free; and that there is nothing bad which does not do the contrary to what has been mentioned.