Reward may follow on such absolute obedience (_quatrain_ 40). We remember what is said by Fra Giovanni in the prison of Viterbo[9]: "Endurez, souffrez, acceptez, veuillez ce que Dieu veut, et votre volonté sera faite sur la terre comme au ciel." And perhaps the dawn for you may be your camel's dawn (_quatrain_ 41); it was usual for Arabs on the point of death to say to their sons: "Bury my steed with me, so that when I rise from the grave I will not have to go on foot." The camel was tied with its head towards its hind legs, a saddle-cloth was wrapped about its neck, and it was left beside the grave until it died. Meanwhile, if the master is a true believer, says Mahomet, his soul has been divided from the body by Azrael, the angel of death. Afterwards the body is commanded to sit upright in the grave, there to be examined by the two black angels, Monkar and Nakyr (_quatrain_ 42), with regard to his faith, the unity of God and the mission of Mahomet. If the answers be correct, the body stays in peace and is refreshed by the air of paradise; if incorrect, these angels beat the corpse upon his temples with iron maces, until he roars out for anguish so loudly that he is heard by all from east to west, except by men and jinn. Abu'l-Ala had little confidence in these two angels; he reminds one of St. Catherine of Sienna, a visionary with uncommon sense, who at the age of eight ran off one afternoon to be a hermit. She was careful to provide herself with bread and water, fearing that the angels would forget to bring her food, and at nightfall she ran home again because she was afraid her parents would be anxious. With regard to the angel of death, Avicenna has related that the soul, like a bird, escapes with much trouble from the snares of earth (_quatrain_ 43), until this angel delivers it from the last of its fetters. We think of the goddess Rân with her net. Death is imagined (_quatrain_ 44) as a fowler or fisher of men, thus: "Dô kam der Tôt als ein diep, und stal dem reinen wîbe daz leben ûz ir lîbe."[10] On account of its brilliance a weapon's edge (_quatrain_ 46) has been compared in Arab poetry with sunlit glass, with the torch of a monk, with the stars and with the flame in a dark night. Nor would an Arab turn to picturesque comparisons in poetry alone. Speaking of a certain letter, Abu'l-Ala assures the man who wrote it that "it proceeds from the residence of the great doctor who holds the reins of prose and verse" (_quatrain_ 50). Now with regard to glass, it was a very ancient industry among the Arabs. In the second century of the Hegira it was so far advanced that they could make enamelled glass and unite in one glass different colours. A certain skilled chemist of the period was not only expert in these processes (_quatrain_ 52), but even tried to make of glass false pearls, whereon he published a pamphlet.