to persuasion; analytical examination and philosophy, with reference to truth; omitting nothing which can bear upon discovery, or judgment, or use. Accordingly, with reference to discovery, he has furnished us with topics and works on method, which form a complete armoury of propositions, from which it is easy to provide one’s self with an abundance of probable arguments for every kind of question. And with reference to judgment, he has given us the former and posterior analytics; and by means of the former analytics, we may arrive at a critical examination of principles; by means of the posterior, we may examine the conclusions which are deduced from them. With reference to the use or application of his rules, he has given us works on discussion, on question, on disputation, on sophistical refutation, on syllogism, and on things of that sort.
He has also furnished us with a double criterion of truth. One, on the perception of those effects, which are according to imagination; the other, the intelligence of those things which are ethical, and which concern politics, and economy, and laws. The chief good he has defined to be the exercise of virtue in a perfect life. He used also to say, that happiness was a thing made up of three kinds of goods. * First of all, the goods of the soul, which he also calls the principal goods in respect of their power; * secondly, the goods of the body, such as health, strength, beauty, and things of that sort; * thirdly, external goods, such as wealth, nobility of birth, glory, and things like those. And he taught that virtue was not sufficient of itself to confer happiness; for that it had need besides of the goods of the body, and of the external goods, for that a wise man would be miserable if he were surrounded by distress, and poverty, and circumstances