Once upon a time [Season 3, Episode 20]

Because no matter what you change of your past... one thing shall remain the same... Who you are. And that is a fate you can never escape.

You let go of your envy. You took control of your destiny.

— We're leaving.
— What does the boy think?
— He's a kid. He wants chocolate milk in his cereal. I'm his mother. I know what's best for him.
— What's best for him... or for you?

Good magic stopped her. And good magic doesn't exact vengeance.

Once upon a time, you were a villain, mom. But you've changed. You're a hero now. And defeating bad guys is what heroes do.

I tried to be good once, but it wasn't in the cards. This is who I am, and it's who you are!

— Heroes don't kill.
— So now you're a hero?
— Today, I am.