Philosophy takes as her aim the state of happiness...she shows us what are real and what are only apparent evils. She strips men's minds of empty thinking, bestows a greatness that is solid and administers a check to greatness where it is puffed up and all an empty show; she sees that we are left no doubt about the difference between what is great and what is bloated.
When some state or other offered Alexander a part of its territory and half of all its property he told them that 'he hadn't come to Asia with the intention of accepting whatever they cared to give him, but of letting them keep whatever he chose to leave them.' Philosophy, likewise, tells all other occupations: 'It's not my intention to accept whatever time is leftover from you; you shall have, instead, what I reject.' Give your whole mind to her.