Lecture on Chapter 3 of Book I of Aristotle’s Rhetoric

With respect to enthymemes, however, there is a great difference, of which nearly all the professors of rhetoric are particularly ignorant, and which is conversant with the dialectic method of syllogisms. For some enthymemes pertain to rhetoric, just as some syllogisms subsist according to the dialectic method; but others pertain to other arts and faculties, some of which are in existence, and others are not yet discovered. Hence, they are not understood by those that hear them, and if rhetoricians employ them more than is fit, they relinquish their own art, and exchange it for some other. But what we have said, will become more evident, by a more copious discussion…