Aristotle on Intellectual Ambitiousness

Recently I acquired the two-volume Complete Works of Aristotle (order from Amazon), which promises many hours of illuminating reading. The first book I started to look through is Metaphysics, in which Aristotle argues that no knowledge is properly beyond man. He writes of the subject at hand (Book I (A) 2, or page 1555):

Hence the possession of it might be justly regarded as beyond human power; for in many ways human nature is in bondage, so that according to Simonides ‘God alone can have this privilege’, and it is unfitting that man should not be content to seek the knowledge that is suited to him. If, then, there is something in what the poets say, and jealousy is natural to the divine power, it would probably occur in this case above all, and all who excelled in this knowledge would be unfortunate. But the divine power cannot be jealous (indeed, according to the proverb, ‘bards tell many a lie’), nor should any science be thought more honourable than one of this sort.

So, while Aristotle comfortably refers to God, Aristotle is careful not to place any knowledge beyond the reach of man. This approach is the exact opposite of that of, say, Saint Augustine (and of many modern evangelicals).

Aristotle adds that metaphysics “would be most meet for God to have… for God is thought to be among the causes of all things and to be a first principle…” What Aristotle means by this “first principle,” and why he finds it necessary, is one of the main points that I hope to learn from the volumes.