Wherefore one can see that Authority is equivalent to an act worthy of faith and obedience.
[Here is a small break in the original, containing some such words as--Worthy, nay, most worthy, of obedience and of faith is Aristotle:] hence it is evident that his words are a supreme and chief Authority.
That Aristotle is most worthy of faith and obedience, one can thus prove.

Amongst workmen and artificers of different Arts and Manufactures, which are all directed to one final work of Art, or to one building, the Artificer or Designer of that work must be completely believed in, and implicitly obeyed by all, as the man who alone beholds the ultimate end of all the other ends.

Hence the sword-cutler must believe in the knight, so must the bridle-maker and saddle-maker and the shield-maker, and all those trades which are appointed to the profession of knighthood.

And since all human actions require an aim, which is that of human life, to which man is appointed inasmuch as he is man, the master and artificer who considers that aim and demonstrates it ought especially to be believed in and obeyed; and he is Aristotle; wherefore he is most worthy of faith and obedience.
And in order to see how Aristotle is the master and leader of Human Reason in so far as it aims at its final operation, it is requisite to know that this our aim of life, which each one naturally desires, in most ancient times was searched for by the Wise Men; and since those who desire this end are so numerous, and their desires are as it were all singularly different, although they exist in us universally, it was nevertheless very difficult to discern that end whereon rightly each human appetite or desire might repose.
There were then many ancient philosophers, the first and the chief of whom was Zeno, who saw and believed this end of human life to be solely a rigid honesty, that is to say, rigid without regard to any one in following Truth and Justice, to show no sorrow, to show no joy, to have no sense of any passion whatever.

And they defined thus this honest uprightness, as that which, without bearing fruit, is to be praised for reason of itself.