
“When we understand this we see clearly that the subject round which the alternative senses play must be twofold. And we must therefore consider the subject of this work [the Divine Comedy] as literally understood, and then its subject as allegorically intended. The subject of the whole work, then, taken in the literal sense only is "the state of souls after death" without qualification, for the whole progress of the work hinges on it and about it. Whereas if the work be taken allegorically, the subject is "man as by good or ill deserts, in the exercise of the freedom of his choice, he becomes liable to rewarding or punishing justice."”
Hiis visis, manifestum est quod duplex oportet esse subiectum circa quod currant alterni sensus. Et ideo videndum est de subiecto huius operis, prout ad litteram accipitur; deinde de subiecto, prout allegorice sententiatur. Est ergo subiectum totius operis, litteraliter tantum accepti, status animarum post mortem simpliciter sumptus. Nam de illo et circa illum totius operis versatur processus. Si vero accipiatur opus allegorice, subiectum est homo, prout merendo et demerendo per arbitrii libertatem iustitie premiandi et puniendi obnoxius est.
Letter to Can Grande (Epistle XIII, 23–25), as translated by Charles Singleton in his essay "Two Kinds of Allegory" published in Dante Studies 1 (Harvard University Press, 1954), p. 87.
Epistolae (Letters)