The gods alone are simply wise. In order to live well, men must possess the arts. As we have seen, in order to possess the arts men must live together in communities, under laws. The arts are dependent upon each other for their survival. Just as the artisan must have his needs provided for by other artisans if he is to practice his art, so the philosopher must live among other men if he is to philosophize.
Thought requires leisure.
If a man spends his time struggling to survive, he cannot philosophize. Philosophy is dependent for its existence on the community of men. The philosopher distinguishes between knowledge and opinion. He does not recognize any authority but reason. He seeks to replace opinion with knowledge.