When I'm reading a book I like to bookmark or save my favorite line(s) so I can read them over and over again.
While I haven't quite finished reading THE GUERNSEY LITERARY AND POTATO PEEL SOCIETY by Mary Ann Shaffer and Annie Barrows, I already know what my favorite lines from the book are:
"That's what I love about reading: one tiny thing will interest you in a book, and that tiny thing will lead you onto another book, and another bit there will lead you into a third book. It's geometrically progressive–all with no end in sight, and for no other reason than sheer enjoyment."