Then ‘Abd al-Latif passes to present al-Farabi’s Aristotle who holds that the perfection of man sought by Plato is not self-evident or easy to explain by way of a demonstration which leads to certainty. He believes, therefore, that it is necessary to start with a prior consideration. There are four things which by nature are desired by man in so far as they are good: the soundness of the body, of the senses, of the ability to discern that which leads to the health of the body and the senses, and of the ability to obtain that which leads to their soundness. In the second place man desires to know the causes of the sensible things and also the causes of what he sees in his soul, and he discovers that the more he knows the more he feels pleasure. Thus according to Aristotle, the knowledge sought by man can be said to be of two types: the first is a useful knowledge sought for the soundness of the body, of the senses, and of the other two abilities, the second is desired and desirable in itself for the pleasure that a man experiences in apprehending it: for instance, the myths or the stories of nations.