Rory's mantra and epitaph:

... all your nonsenses and truths, your finery and squalid options (squal-adoptions), combine and coalesce, to one noise including laugh and whimper, scream and sigh, forever and forever repeating, in any tongue we care to choose, whatever lessened, separated message we want to hear. It all boils down to nothing, and where we have the means and will to fix our reference within that flux; there we are. If it has any final signal, the universe says simply, but with every possible complication, "Existence", and it neither pressures us, nor draws us out, except as we allow. Let me be part of that outrageous chaos ... and I am.
(129-130 + 475)

Prentice and Ash's pact:

She squeezed again, four times, the second pulse longer than the other three. Another pause, during which I realised  - it was morse! Then another four pulses, the second one short and the others long.
I.L.Y.
I had raised my head away from her shoulder while I concentrated on what she was doing in there; now I lowered my face to her skin again. I laughed, very lightly, and after a moment so did she, and then I sent the same signal back, with a single long pulse at the end: I.L.Y.T.
And I swear the sending made the signal all the truer.
And that falling was followed by two more shared fallings, as we fell apart, and the asleep-
(492)