Well, maybe you need to struggle some more!
-- Claire (chapter 4)

Importance: Claire says this to her dad when he seems not to understand her frustrations with dance. The line haunts Claire throughout the novel, as it is the last thing she says to her father before he has his stroke the following morning. Her words show her lack of consideration for her dad, and the guilt she feels for this outburst gradually helps her learn how to better appreciate her friends and family.

...time is brain.
-- Kathy (chapter 6)

Importance: Kathy, one of the paramedics who brings David to the hospital, says this to Claire while they are in the ambulance. She is explaining to Claire the details of the doctors' processes to help stroke patients as soon as possible. Her words stay with Claire for many months, making her realize the urgency of her father's condition, as well as the connection between mind and body.

...If...
-- Narrator (chapter 8)