From Zoroastrianism's Sacred Menog-i Khrad: Chapters 4-13, Part 2 of 2

The sage asked the spirit of wisdom thus:‘Is it possible to go from region to region [karshwar], or not? From what substance is the sky made? And how and in what manner is the mingling of the water in the earth?’The spirit of wisdom answered thus:‘Without the permission of the sacred beings, or the permission of the demons, it is then not possible for one to go from region to region.’‘The sky is made from the substance of the blood-stone, such as they also call diamond(almast).’ ‘And the mingling of the water in the earth is just like the blood in the body of man.’