Well, that's a very nice sentiment. But when I change her back into her true self...

4 seconds sound clip from the The Last Unicorn movie soundboard.

You can hear this line at 01:21:23.287 in the Blu-ray version of the movie.

Quote context

[...]

- Haggard has destroyed the clock. Now there's no way back and no way out but through the Red Bull's passage.

- And the rest you know. We came here seeking unicorns and we have possibly found them, at last.

- I used to have a dream, over and over, about standing at my window in the middle of the night and seeing the Bull, the Red Bull.

- Yes. Driving unicorns into the sea. It was no dream.

- Haggard has them all now, drifting in and out on the tide for his delight, all but one. That one is the Lady Amalthea.

- Unicorn, mermaid, sorceress, no name you would give her would surprise or frighten me. I love whom I love.

- Well, that's a very nice sentiment. But when I change her back into her true self...

- I love whom I love.

- I heard what you said. I will go no further.

- There's no choice. We have to go on.

- Don't let him change me.

[...]