Killian: Emma, when we met, there was just one thing that mattered to me: getting my revenge. And you did something that no one else ever could, you showed me that a heart full of love was the most precious treasure of all, and one that I don’t intend to lose. They say that a captain’s heart belongs to his ship, but with this ring, it now belongs to you.
Emma: Killian, I spent so much of my life on my own, and then, Henry found me, and brought me to Storybrooke, and helped me find the rest of my family. But just because you learn that you come from true love, doesn’t mean you believe that you will never find it. But thanks to you, now I have.
Captain Swan in episode 6.20: The Song In Your Heart