what if "letters to Juliet"

i've watched this movie about 3 months ago. and i think, the best part of this movie is; when amanda seyfried (as sophie) wrote a letter to claire when she found an unanswered letter by a claire smith at 1957. claire is an old woman who searching for her first love, lorenzo bartholini. about 50 years ago since claire left him.

this is the letter that sophie wrote it to claire :

Dear Claire,

"What" and "If" are two words as non-threatening as words can be.

But put them together side-by-side and they have the power to haunt you for the rest of your life: 

What if? What if? What if? I don't know how your story ended but if what you felt then was true love, 

then it's never too late. If it was true then, why wouldn't it be true now? You need only the courage to follow your heart.

I don't know what a love like Juliet's feels like - love to leave loved ones for,

love to cross oceans for but I'd like to believe if I ever were to feel it, 

that I will have the courage to seize it. 

And, Claire, if you didn't, I hope one day that you will.

All my love, Juliet.