"That light," said the Chaplain, "is it going up or coming down?"
"It’s coming down," said Lord Asriel, "but it isn’t light. It’s Dust."
Something in the way he said it made Lyra imagine dust with a capital letter, as if this wasn’t ordinary dust.

Philip Pullman, The Golden Compass

Into this wild abyss,
The womb of nature and perhaps her grave,
Of neither sea, nor shore, nor air, nor fire,
But all these in their pregnant causes mixed
Confusedly, and which thus must ever fight,
Unless the almighty maker them ordain
His dark materials to create more worlds,
Into this wild abyss the wary fiend
Stood on the brink of hell and looked a while,
Pondering his voyage…

John Milton, Paradise Lost