A Thousand Years – Christina Perri
"A Thousand Years" is a song by Christina Perri, written for the soundtrack of The Twilight Saga: Breaking Dawn – Part 1. It is a gentle love song about waiting for someone, finding the courage to love, and being "one step closer" to them.
The lyrics are copyrighted, so I have not reproduced them here. You can listen to the song and read the lyrics on YouTube or on an official lyrics site.