"An eye for an eye and the whole world goes blind"
Coral, Delirium by Lauren Oliver

"That's the real trouble with the world, too many people grow up"
Walt Disney

"The road goes ever on and on
 Down from the door where it began 
Now far ahead the road has gone and I must follow if I can 
Pursuing it with eager feet 
Until it joins some larger way 
Where many paths and errands meet 
And wither then? I cannot say."
Bilbo, The Fellowship of the Ring by J.R.R Tolkien

"Fear doesn't shut you down, it wakes you up"
Tobias, Divergent by Veronica Roth

"Break my heart, break it a thousand times if you like. It was only ever yours to break anyway."
Maxon, The Selection by Kiera Cass

"Anyone can betray anyone." 
Mare, Red Queen by Victoria Aveyard

"Keep a weather eye on the horizon"
Will Turner, Pirates of the Caribbean