For if that reason does this for itself, our reason also can do it. But we shall require something else, the thing, will go on to infinity and have no end.
Reason therefore is analysed by itself.
This is the reason, I suppose, why they place the logical art first, as in the measuring of corn we place first the examination of the measure. But it is a thing which can measure corn. Logic also produces no fruit. To understand the will of nature. For if it is true that all men err involuntarily, and you have learned the truth, of necessity you must act right.