Lib's three-year tenure at the hospital where she had worked was "[r]emarkable in itself, as most of the nurses stayed no more than a matter of months; irresponsible scrubbers, Mrs. Gamps in the old mould, whining for their rations of porter. Not that Lib was particularly appreciated there. She'd heard Matron describe veterans of Miss N.'s Crimean campaign as 'uppish.
-- Lib (One paragraph Location 113 (Kindle edition))

Importance: This comment is important because it establishes Lib's view of herself as someone who believes that she is superior to others. In Lib's case, Matron has described her perfectly, This comment foreshadows Lib's attitude towards everyone that she meets in the village. This quote is found near the very beginning of the book, which is significant because her training is almost the first thing that readers discover about Lib.

But observation was only the first piece of the puzzle. Miss N. had taught her nurses to watch...
-- The narrator (One paragraph Location 124 (Kindle edition))