Freshly turned dirt, manure, pine, something rotten and something sweet. Somehow he knew that those were the smells of a farm.
-- Thomas (Chapter 2)

Importance: Thomas has lost his memory and finds himself on a farm. He doesn’t know how he got there.

When you bloody need to know, you’ll know, Greenie.
-- Newt (Chapter 6)

Importance: This passage points to the secretive nature of the Glade where Thomas had mysteriously found himself.

Too bad I can’t remember my whole life. Maybe I love killing animals.
-- Thomas (Chapter 11)

Importance: Thomas, who had lost his memory, would begin his training as a slicer. Part of his responsibility would be butchering the farm animals.

For the second night in a row, Thomas went to bed with the haunting image of Ben’s face burned into his mind, tormenting him.
-- Thomas (Chapter 15)

Importance: Thomas felt guilty that Ben was Banished by the Keepers for attacking him. Although Thomas had nothing to do with the incident...