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Well, we have now stated the nature and objects of Practical

Wisdom and Science respectively, and that they belong each to a

different part of the Soul. But I can conceive a person

questioning their utility.

"Science," he would say, "concerns itself with none of the causes

of human happiness (for it has nothing to do with producing

anything): Practical Wisdom has this recommendation, I grant, but

where is the need of it, since its province is those things which

are just and honourable, and good for man, and these are the

things which the good man as such does; but we are not a bit the

more apt to do them because we know them, since the Moral Virtues

are Habits; just as we are not more apt to be healthy or in good

condition from mere knowledge of what relates to these (I

mean,[47] of course, things so called not from their producing

health, etc., but from their evidencing it in a particular

subject), for we are not more apt to be healthy and in good

condition merely from knowing the art of medicine or training.