Sibyl, return from his visit to the underworld, where he has met, among others, his dead father Anchises: Two gates the silent house of Sleep adorn; Of polish'd ivory this, that of transparent horn: True visions thro' transparent horn arise; Thro' polish'd ivory pass deluding lies. Of various things discoursing as he pass'd, Anchises hither bends his steps at last. Then, thro' the gate of iv'ry, he dismiss'd His valiant offspring and divining guest. Why Virgil has Aeneas return through the ivory gate (whence pass deluding lies) and not through that of horn is uncertain. One theory is that it refers to the time of night at which he returned. Jorge Luis Borges accepted the view that, for Virgil, what we call reality is not in fact such; that Virgil may have considered the Platonic world of the archetypes to be the real world. Another explanation is that Virgil is thus indicating that what he has recounted is not to be taken as literal fact. In John Wesley's last sermon, preached on 17 January 1791, he spoke of how uncertain even the best conjectures about the invisible world were without revelation: "The most finished of all these accounts, is that of the great Roman poet. Where observe how warily he begins, with that apologetic preface, – Sit mihi fas audita loqui – 'May I be allowed to tell what I have heard'. And, in the conclusion, lest anyone should imagine he believed any of these accounts, he sends the relater of them out of hades by the ivory gate, through which, he had just informed us, that only dreams and shadows pass, – a very plain intimation, that all which has gone before, is to be looked upon as a dream!" Other Latin writing In his Silvae V iii 285–290, a lament for his dead father, the poet Publius Papinius Statius, expresses the wish that his father may come to him from the abode of the dead in the form of a true dream, passing therefore through the gate of horn: Thence mayst thou pass to where the better gate of horn o'ercomes the envious ivory, and in the semblance of a dream teach me what thou wert wont to teach. In his Cupid Crucified (line 103, the last line of the poem), 4th century AD Latin poet Ausonius says that Cupid escapes through the gate of ivory (portaque evadit