Answer:
The quote is about how when we are young, we are told to savour our youth because it's fleeting. When you're young though, it can feel like forever and it's harder to see how fleeting youth truly is. I believe this was included at the start of the novel because the book later follows Connor, who is only a boy.
Answer:
I think If anything was left floating freely in the cabin, it would crash to the ground and possibly be damaged.
The answer is desire! I hope this helps!