For 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, Book II

For The Amber Spyglass:

The morning comes, the night decays, the watchmen leave their stations;
The grave is burst, the spices shed, the linen wrapped up;
The bones of death, the cov'ring clay, the sinews shrunk & dry'd
Reviving shake, inspiring move, breathing, awakening,
Spring like redeemed captives when their bonds & bars are burst,
Let the slave grinding at the mill run out into the field,
Let him look up into the heavens & laugh in the bright air;
Let the inchained soul, shut up in darkness and in sighing,
Whose face has never seen a smile in thirty weary years,
Rise and look out; his chains are loose, his dungeon doors are open;
And let his wife and children return from the oppressor's scourge.
They look behind at every step & believe it is a dream,
Singing: "The Sun has left his blackness & has found a fresher morning,
And the fair Moon rejoices in the clear & cloudless night;
For Empire is no more, and now the Lion & Wolf shall cease."

--from "America: A Prophecy" by William Blake

O stars,
isn't it from you that the lover's desire for the face
of his beloved arises? Doesn't his secret insight
into her pure features come from the pure constellations?

--from "The Third Elegy" by Rainer Maria Rilke, translated by Stephen Mitchell

Fine vapors escape from whatever is doing the living.
The night is cold and delicate and full of angels
Pounding down the living. The factories are all lit up,
The chime goes unheard.
We are together at last, though far apart.

--from "The Ecclesiast" by John Ashbery

In some editions, there is a quotation from either Milton or Blake at the head of every chapter.

This work is all three books (Northern Lights aka The Golden Compass, The Subtle Knife, and The Amber Spyglass) in one volume.