My two are not one-liners but hey ho.
The first is from That Lady by Kate O'Brian:
"He drew her hard against him, and kissed her mouth as if in first desire. Ana thought - this is the last embrace of my mortal life; people can't often know when they have reached the last. But I do know. Good-bye, she answered him now with her whole self, with all of strength and gratitude in her possession - good-bye to you, and also to that long-assuaged and quieted me that you alone commanded. Good-bye, dear past, dear sin, and go from me in peace. I loved you and I have atoned and will atone."
The second one is from The Farthest Shore :
"As Lookfar approached the islands Arren saw the dragons soaring and circling on the morning wind, and his heart leapt up with them with a joy, a joy of fulfilment, that was like pain. All the glory of mortality was in that flight. Their beauty was made up of terrible strength, and utter wildness, and the grace of reason. For these were thinking creatures with speech, and ancient wisdom: in the patterns of their flight there was a fierce, willed concord.
Arren did not speak, but he thought: I do not care what comes after; I have seen the dragons on the wind of morning"