 But al-Farabi has presented to us the meaning of this kind of argument, and Avicenna, al-Ghazali, and Averroes have done likewise. Because of this, one ought to present an account of the nature of poetic argument, and it falls to logic alone to compose such a book, since the composition of argumentation pertains to logic alone…The appropriate presentation of this argument is found in [my] Moralis philosophia, and in its use, and likewise in theological proofs and doctrines; and in such moral matters, this kind of argument moves a [person] much more than does a demonstrative argument since it has much greater power. And I have already composed a treatise on this [rhetorical-poetic] argument in my works on logic, and I have shown there what is proper to this science. ([OHI, XVI], 16–17)