'Everything must have a beginning, to speak in Sanchean phrase; and that beginning must be linked to something that went before. The Hindus give the world an elephant to support it, but they make the elephant stand upon a tortoise. Intervention, it must be humbly admitted, does not consist in creating out of void, but out of chaos; the materials must, in the first place, be afforded: it can give form to dark, shapeless substances but cannot bring into being the substance itself' (Author's Introduction, xxvi).