Curdie was the son of Peter the miner. He lived with his father and mother in a cottage built on a mountain, and he worked with his father inside the mountain.

A mountain is a strange and awful thing. In old times, without knowing so much of their strangeness and awfulness as we do, people were yet more afraid of mountains. But then somehow they had not come to see how beautiful they are as well as awful, and they hated them - and what people hate they must fear. Now that we have learned to look at them with admiration, perhaps we do not feel quite awe enough of them. To me they are beautiful terrors.

I will try to tell you what they are. They are portions of the heart of the earth that have escaped from the dungeon down below, and rushed up and out. For the heart of the earth is a great wallowing mass, not of blood, as in the hearts of men and animals, but of glowing hot, melted metals and stones. And as our hearts keep us alive, so that great lump of heat keeps the earth alive: it is a huge power of buried sunlight - that is what it is.

Now think: out of that cauldron, where all the bubbles would be as big as the Alps if it could get room for its boiling, certain bubbles have bubbled out and escaped - up and away, and there they stand in the cool, cold sky - mountains. Think of the change, and you will no more wonder that there should be something awful about the very look of a mountain: from the darkness - for where the light has nothing to shine upon, much the same as darkness - from the heat, from the endless tumult of boiling unrest - up, with a sudden heavenward shoot, into the wind, and the cold, and the starshine, and a cloak of snow that lies like ermine above the blue-green mail of the glaciers; and the great sun, their grandfather, up there in the sky; and their little old cold aunt, the moon, that comes wandering about the house at night; and everlasting stillness, except for the wind that turns the rocks and caverns into a roaring organ for the young archangels that are studying how to let out the pent-up praises of their hearts, and the molten music of the streams, rushing ever from the bosoms of the glaciers fresh born.  ...

The Princess and Curdie