Robert Langbaum has recently offered another affirmative answer to the question whether Guido is saved in the end of his second monologue in The Ring and the Book. Langbaum reviews the previous answers which have been given to this question:
Such early critics as Henry Jones, Charles W. Hodell, and Arthur Symons saw promise of deliverance in Guido's final utterance. But in 1920, A. K. Cook, in his influential Commentary upon The Ring and the Book, saw Guido as like Iago beyond redemption, and he was followed in this view by W. C. De-Vane in his even more influential Browning Handbook. Among recent critics, Park Honan sees Guido as saved; while Richard Altick and James F. Loucks, in their book-length study of the poem, think him irredeemable because the devil incarnate. Our stand does depend on whether we see Guido as human and therefore capable of development, or whether we see him as belonging to another order of existence, as an Iago or devil figure, (p. 290)