It's for the best.
3 seconds sound clip from the Frozen movie soundboard.
You can hear this line at 00:07:27 in the Blu-ray version of the movie.
Quote context
[...]
- I recommend we remove all magic. Even memories of magic, to be safe.
- But don't worry. I'll leave the fun.
- But she won't remember I have powers?
- She can learn to control it. I'm sure.
- Until then... We'll lock the gates. We'll reduce the staff.
[...]