Such ideas, even in special details, were common property. Dante transformed the mediaeval vision of the world beyond the grave into a supreme work of art, making it the receptacle for all that was noblest in the thought and aspiration of the centuries down to his own day. If a hint or two came from _Ibernia fabulosa_, as Ariosto calls Ireland, the main suggestion was Roman; and Virgil was his imperial master in very fact, as he was his guide by poetical fiction (_Inf._ i. 82-87): “O honour and light of the other poets, may the long study avail me, and the great love, that has made me search thy volume. Thou art my master and my author; thou alone art he from whom I took the fair style that hath gained me honour.” The influence of Virgil pervades the whole poem, and next to his comes that of Lucan. Ovid was mainly a source of classical mythology (frequently spiritualised in Dante’s hands); the contribution of Horace, Statius, and Juvenal is slighter. And Dante was as familiar with the Bible as with the _Aeneid_ and the _Pharsalia_; indeed, one of the most salient characteristics of the _Commedia_ is the writer’s adaptation of the message of the Hebrew prophets to his own times in the language and with the consummate art of the Latin poets. In its degree, the influence of Boëthius is as penetrating as that of Virgil; Orosius has contributed as much history as has Livy. The philosophy of the poem is naturally coloured by Aristotle, studied in the Latin translations as interpreted by Albertus Magnus and Aquinas. Augustine and Aquinas (more generally the latter) are the poet’s chief theological sources; his mysticism has derived something from Richard of St. Victor and Bonaventura as well as from Dionysius. But he deals with his matter with independence, as a poet, in the light of his own spiritual experience, his own imaginative interpretation of life and history, his own observation of nature. Though versed in a super-eminent degree with most of the knowledge, sacred and profane, possible to a man of his epoch, and well-read to an almost incredible extent when the circumstances of his life are considered, Dante’s main and direct source of inspiration lay, not in books, but in that wonderful world of the closing Middle Ages that lay open to his gaze, as from a celestial watch-tower of contemplation: “The little space of earth that maketh us so fierce, as I turned me with the eternal Twins, all appeared to me from the hills to the sea” (_Par._ xxii. 151-153).