“...and all I have to do is think of her
Something in the things she shows me
I Don't want to leave her now
You know I believe and how“
-George Harrison, The Beatles
All of Twilight's experiences since her arrival in Ponyville have been lessons leading up to a "final exam." Solving Starswirl The Bearded's last spell presented Twilight with a challenge that brought into play what she had spent her lifetime studying. Her lessons in Ponyville were the last step toward preparing for that test. It earned her the title Princess and transformed her into an Alicorn.
But there was one last lesson that her heart had been learning during her time in Ponyville. Her final exam would begin with a serious accident and what she discovers about herself in its wake. That discovery would lead her on an epic journey that would break her heart, shake her unquestioning devotion to ponies she'd always held closest to her heart and change the future of Equestira.
The moment she saw them, Clover fell in love with the two little alicorn foals "You must do more than keep these sisters safe" Starswirl warned her."You must, at any cost, keep them alive..."
Rainbow Dash gets her share of fan mail, most of it is from fans, but a few are from ponies with other things in mind...
A single event opens the eyes of Twilight to something she had, for so long, denied. The depth of the love she discovers will forever change what she values and will lead her on the first steps of a journey that will affect the future of Equestria.