OF THE SAME INTERPRE-

TER, COMMENTARIES ON THE SAME BOOK.

E

A decorative initial 'D' features a seated figure, likely a scholar or saint, depicted within a square frame.Doctrine is either an action which is transferred from the teacher to the student, or a habit of mind produced by the custom of teaching. Each is performed either with a method, that is, a way and a logic, or without this. But that which consists of a method is taught having observed order from the beginning to the end, and it uses division, definition, demonstration, and resolution (which they call logical methods) as its instruments. For by these, every art—after it has been disposed in some order of these—is perfected and as it were delineated, as we shall teach in what follows. Since, therefore, the disposition of all doctrine is threefold—one, indeed, in which the end is resolved into those things which are referred to it; another, however, in which a return is made to the same end by the same way, but in reverse order; the third, truly, in which the definition is dissolved into its parts—there will be three altogether ordered doctrines. For they cannot be instituted in any other way, since we teach either in the order in which they are discovered—namely, having begun from the end known and understood by us, proceeding through all those things which are referred to it, placed in order—