Season 1, Episode 2:
The Thing You Love Most
Maleficent: Don't do this, this curse. There are lines even we shouldn't cross. All power comes with a price. Enacting it will take a terrible toll. It will leave an emptiness inside you—a void you will never be able to fill.
The Evil Queen: Then so be it.
Emma: If I stay, Henry's only going to keep getting hurt.Regina sees Emma as a possible threat to her relationship with Henry and does everything in her power to force Emma into permanently leaving Storybrooke while the chilling circumstances of how the Evil Queen released her curse upon the Enchanted Forest are revealed along with the price she paid in order to do so.
Mary Margaret: What'll happen if you go? I think the very fact that you want to leave is why you have to stay. You care about him. Who will protect Henry if you won't?