The metaphor I took from it is that a page on its own is a sad, incomplete thing, even if it has a pretty picture. A complete life is better than a one-page dream (or something like that; some lives are really awful).
On another note, the book is still missing the page at the end that Emma and Henry tore out of it at the beginning of season 1, right? Kind of silly for Regina to want to change the book when she doesn’t know how it ends.
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Gaultheria's fanvids: http://youtube.com/sagethrasher