Possibly far, far too obvious, but it's the only one that springs to mind right now. I just don't tend to remember last lines. It seems to me that the importance of last lines is that they end a story on the right tone, not that they necessarily be memorable in themselves. But I digress, the line I remember:

"It is a far, far better thing that I do, than I have ever done; it is a far, far better rest that I go to than I have ever known."