No matter what policy or course of action man pursues in his life, indeed he looks after nothing but his happiness and prosperity. The recognition of the happiness of something is of minor importance with regard to-the recognition of the thing itself; that is, unless we know ourselves, we will not know our actual needs whose fulfillment provides us with happiness. Therefore, the most essential duty of man is to know himself so as to perceive his happiness and prosperity and endeavor to fulfill his needs by the means that are at his disposal.